ja

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

人気のある三角関数 >

(sec^2(x))/2 =2cos^2(x)

解

\frac{sec ^{2} ( x )}{2} = 2 cos^{2} (x)

解

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

+1

度

x = 4 5^{\circ} + 36 0^{\circ} n, x = 31 5^{\circ} + 36 0^{\circ} n, x = 13 5^{\circ} + 36 0^{\circ} n, x = 22 5^{\circ} + 36 0^{\circ} n

解答ステップ

\frac{sec ^{2} ( x )}{2} = 2 cos^{2} (x)

両辺から

2 cos^{2} (x)

を引く

\frac{sec ^{2} ( x )}{2} - 2 cos^{2} (x) = 0

簡素化

\frac{sec ^{2} ( x )}{2} - 2 cos^{2} (x) : \frac{sec ^{2} ( x ) - 4 cos ^{2} ( x )}{2}

\frac{sec ^{2} ( x )}{2} - 2 cos^{2} (x)

元を分数に変換する:

2 cos^{2} (x) = \frac{2 cos ^{2} ( x ) 2}{2}

= \frac{sec ^{2} ( x )}{2} - \frac{2 cos ^{2} ( x ) \cdot 2}{2}

分母が等しいので, 分数を組み合わせる:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{sec ^{2} ( x ) - 2 cos ^{2} ( x ) \cdot 2}{2}

数を乗じる:

2 \cdot 2 = 4

= \frac{sec ^{2} ( x ) - 4 cos ^{2} ( x )}{2}

\frac{sec ^{2} ( x ) - 4 cos ^{2} ( x )}{2} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

sec^{2} (x) - 4 cos^{2} (x) = 0

因数

sec^{2} (x) - 4 cos^{2} (x) : (sec (x) + 2 cos (x)) (sec (x) - 2 cos (x))

sec^{2} (x) - 4 cos^{2} (x)

sec^{2} (x) - 4 cos^{2} (x)

を書き換え

sec^{2} (x) - (2 cos (x))^{2}

sec^{2} (x) - 4 cos^{2} (x)

4

を書き換え

2^{2}

= sec^{2} (x) - 2^{2} cos^{2} (x)

指数の規則を適用する:

a^{m} b^{m} = (ab)^{m}

2^{2} cos^{2} (x) = (2 cos (x))^{2}

= sec^{2} (x) - (2 cos (x))^{2}

= sec^{2} (x) - (2 cos (x))^{2}

2乗の差の公式を適用する:

x^{2} - y^{2} = (x + y) (x - y)

sec^{2} (x) - (2 cos (x))^{2} = (sec (x) + 2 cos (x)) (sec (x) - 2 cos (x))

= (sec (x) + 2 cos (x)) (sec (x) - 2 cos (x))

(sec (x) + 2 cos (x)) (sec (x) - 2 cos (x)) = 0

各部分を別個に解く

sec (x) + 2 cos (x) = 0 or sec (x) - 2 cos (x) = 0

sec (x) + 2 cos (x) = 0 :

解なし

sec (x) + 2 cos (x) = 0

三角関数の公式を使用して書き換える

sec (x) + 2 cos (x)

基本的な三角関数の公式を使用する:

cos (x) = \frac{1}{sec ( x )}

= sec (x) + 2 \cdot \frac{1}{sec ( x )}

2 \cdot \frac{1}{sec ( x )} = \frac{2}{sec ( x )}

2 \cdot \frac{1}{sec ( x )}

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot 2}{sec ( x )}

数を乗じる:

1 \cdot 2 = 2

= \frac{2}{sec ( x )}

= sec (x) + \frac{2}{sec ( x )}

\frac{2}{sec ( x )} + sec (x) = 0

置換で解く

\frac{2}{sec ( x )} + sec (x) = 0

仮定:

sec (x) = u

\frac{2}{u} + u = 0

\frac{2}{u} + u = 0 : u = 2 i, u = - 2 i

\frac{2}{u} + u = 0

以下で両辺を乗じる:

u

\frac{2}{u} + u = 0

以下で両辺を乗じる:

u

\frac{2}{u} u + uu = 0 \cdot u

簡素化

\frac{2}{u} u + uu = 0 \cdot u

簡素化

\frac{2}{u} u : 2

\frac{2}{u} u

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{2 u}{u}

共通因数を約分する:

u

= 2

簡素化

uu : u^{2}

uu

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

uu = u^{1 + 1}

= u^{1 + 1}

数を足す:

1 + 1 = 2

= u^{2}

簡素化

0 \cdot u : 0

0 \cdot u

規則を適用

0 \cdot a = 0

= 0

2 + u^{2} = 0

2 + u^{2} = 0

2 + u^{2} = 0

解く

2 + u^{2} = 0 : u = 2 i, u = - 2 i

2 + u^{2} = 0

2

を右側に移動します

2 + u^{2} = 0

両辺から

2

を引く

2 + u^{2} - 2 = 0 - 2

簡素化

u^{2} = - 2

u^{2} = - 2

x^{2} = f (a)

の場合, 解は

x = f (a), - f (a)

u = - 2, u = - - 2

簡素化

- 2 : 2 i

- 2

累乗根の規則を適用する:

- a = - 1 a

- 2 = - 1 2

= - 1 2

虚数の規則を適用する:

- 1 = i

= 2 i

簡素化

- - 2 : - 2 i

- - 2

簡素化

- 2 : 2 i

- 2

累乗根の規則を適用する:

- a = - 1 a

- 2 = - 1 2

= - 1 2

虚数の規則を適用する:

- 1 = i

= 2 i

= - 2 i

u = 2 i, u = - 2 i

u = 2 i, u = - 2 i

代用を戻す

u = sec (x)

sec (x) = 2 i, sec (x) = - 2 i

sec (x) = 2 i, sec (x) = - 2 i

sec (x) = 2 i :

解なし

sec (x) = 2 i

解なし

sec (x) = - 2 i :

解なし

sec (x) = - 2 i

解なし

すべての解を組み合わせる

解なし

sec (x) - 2 cos (x) = 0 : x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

sec (x) - 2 cos (x) = 0

三角関数の公式を使用して書き換える

sec (x) - 2 cos (x)

基本的な三角関数の公式を使用する:

cos (x) = \frac{1}{sec ( x )}

= sec (x) - 2 \cdot \frac{1}{sec ( x )}

2 \cdot \frac{1}{sec ( x )} = \frac{2}{sec ( x )}

2 \cdot \frac{1}{sec ( x )}

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= \frac{1 \cdot 2}{sec ( x )}

数を乗じる:

1 \cdot 2 = 2

= \frac{2}{sec ( x )}

= sec (x) - \frac{2}{sec ( x )}

- \frac{2}{sec ( x )} + sec (x) = 0

置換で解く

- \frac{2}{sec ( x )} + sec (x) = 0

仮定:

sec (x) = u

- \frac{2}{u} + u = 0

- \frac{2}{u} + u = 0 : u = 2, u = - 2

- \frac{2}{u} + u = 0

以下で両辺を乗じる:

u

- \frac{2}{u} + u = 0

以下で両辺を乗じる:

u

- \frac{2}{u} u + uu = 0 \cdot u

簡素化

- \frac{2}{u} u + uu = 0 \cdot u

簡素化

- \frac{2}{u} u : - 2

- \frac{2}{u} u

分数を乗じる:

a \cdot \frac{b}{c} = \frac{a \cdot b}{c}

= - \frac{2 u}{u}

共通因数を約分する:

u

= - 2

簡素化

uu : u^{2}

uu

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

uu = u^{1 + 1}

= u^{1 + 1}

数を足す:

1 + 1 = 2

= u^{2}

簡素化

0 \cdot u : 0

0 \cdot u

規則を適用

0 \cdot a = 0

= 0

- 2 + u^{2} = 0

- 2 + u^{2} = 0

- 2 + u^{2} = 0

解く

- 2 + u^{2} = 0 : u = 2, u = - 2

- 2 + u^{2} = 0

2

を右側に移動します

- 2 + u^{2} = 0

両辺に

2

を足す

- 2 + u^{2} + 2 = 0 + 2

簡素化

u^{2} = 2

u^{2} = 2

x^{2} = f (a)

の場合, 解は

x = f (a), - f (a)

u = 2, u = - 2

u = 2, u = - 2

解を検算する

未定義の (特異) 点を求める:

u = 0

- \frac{2}{u} + u

の分母をゼロに比較する

u = 0

以下の点は定義されていない

u = 0

未定義のポイントを解に組み合わせる:

u = 2, u = - 2

代用を戻す

u = sec (x)

sec (x) = 2, sec (x) = - 2

sec (x) = 2, sec (x) = - 2

sec (x) = 2 : x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

sec (x) = 2

以下の一般解

sec (x) = 2

sec (x)

2 πn

循環を含む周期性テーブル :

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sec (x) 1 \frac{2 3}{3} 22 Undefined - 2 - 2 - \frac{2 3}{3} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sec (x) - 1 - \frac{2 3}{3} - 2 - 2 Undefined 22 \frac{2 3}{3}

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn

sec (x) = - 2 : x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

sec (x) = - 2

以下の一般解

sec (x) = - 2

sec (x)

2 πn

循環を含む周期性テーブル :

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sec (x) 1 \frac{2 3}{3} 22 Undefined - 2 - 2 - \frac{2 3}{3} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sec (x) - 1 - \frac{2 3}{3} - 2 - 2 Undefined 22 \frac{2 3}{3}

x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

すべての解を組み合わせる

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

すべての解を組み合わせる

x = \frac{π}{4} + 2 πn, x = \frac{7 π}{4} + 2 πn, x = \frac{3 π}{4} + 2 πn, x = \frac{5 π}{4} + 2 πn

グラフ

人気の例

sin (\frac{x}{2}) = - 1

10sin(x)+10cos^2(x)=10,0<= x<2pi

10 sin (x) + 10 cos^{2} (x) = 10, 0 \leq x < 2 π

sin(x)-sqrt(3-3sin^2(x))=0

sin (x) - 3 - 3 sin^{2} (x) = 0

4tan^2(x)+21tan(x)-49=0

4 tan^{2} (x) + 21 tan (x) - 49 = 0

2 sin (2 x + 1 5^{\circ}) = 1