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受欢迎的三角函数 >

5sin(2x-pi/2)=0.5

解答

5 sin (2 x - \frac{π}{2}) = 0.5

解答

x = πn + \frac{π}{4} + \frac{0.10016 \dots}{2}, x = πn + \frac{π}{2} + \frac{π}{4} - \frac{0.10016 \dots}{2}

+1

度数

x = 47.86958 \dots^{\circ} + 18 0^{\circ} n, x = 132.13041 \dots^{\circ} + 18 0^{\circ} n

求解步骤

5 sin (2 x - \frac{π}{2}) = 0.5

两边除以

5

5 sin (2 x - \frac{π}{2}) = 0.5

两边除以

5

\frac{5 sin ( 2 x - \frac{π}{2} )}{5} = \frac{0.5}{5}

化简

sin (2 x - \frac{π}{2}) = 0.1

sin (2 x - \frac{π}{2}) = 0.1

使用反三角函数性质

sin (2 x - \frac{π}{2}) = 0.1

sin (2 x - \frac{π}{2}) = 0.1

的通解

sin (x) = a \Rightarrow x = arcsin (a) + 2 πn, x = π - arcsin (a) + 2 πn

2 x - \frac{π}{2} = arcsin (0.1) + 2 πn, 2 x - \frac{π}{2} = π - arcsin (0.1) + 2 πn

2 x - \frac{π}{2} = arcsin (0.1) + 2 πn, 2 x - \frac{π}{2} = π - arcsin (0.1) + 2 πn

解

2 x - \frac{π}{2} = arcsin (0.1) + 2 πn : x = πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}

2 x - \frac{π}{2} = arcsin (0.1) + 2 πn

将

\frac{π}{2}

到右边

2 x - \frac{π}{2} = arcsin (0.1) + 2 πn

两边加上

\frac{π}{2}

2 x - \frac{π}{2} + \frac{π}{2} = arcsin (0.1) + 2 πn + \frac{π}{2}

化简

2 x = arcsin (0.1) + 2 πn + \frac{π}{2}

2 x = arcsin (0.1) + 2 πn + \frac{π}{2}

两边除以

2

2 x = arcsin (0.1) + 2 πn + \frac{π}{2}

两边除以

2

\frac{2 x}{2} = \frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2}

化简

\frac{2 x}{2} = \frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2}

化简

\frac{2 x}{2} : x

\frac{2 x}{2}

数字相除:

\frac{2}{2} = 1

= x

化简

\frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2} : πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}

\frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2}

对同类项分组

= \frac{2 πn}{2} + \frac{\frac{π}{2}}{2} + \frac{arcsin ( 0.1 )}{2}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

数字相除:

\frac{2}{2} = 1

= πn

\frac{\frac{π}{2}}{2} = \frac{π}{4}

\frac{\frac{π}{2}}{2}

使用分式法则:

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

= \frac{π}{2 \cdot 2}

数字相乘:

2 \cdot 2 = 4

= \frac{π}{4}

= πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}

解

2 x - \frac{π}{2} = π - arcsin (0.1) + 2 πn : x = πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

2 x - \frac{π}{2} = π - arcsin (0.1) + 2 πn

将

\frac{π}{2}

到右边

2 x - \frac{π}{2} = π - arcsin (0.1) + 2 πn

两边加上

\frac{π}{2}

2 x - \frac{π}{2} + \frac{π}{2} = π - arcsin (0.1) + 2 πn + \frac{π}{2}

化简

2 x = π - arcsin (0.1) + 2 πn + \frac{π}{2}

2 x = π - arcsin (0.1) + 2 πn + \frac{π}{2}

两边除以

2

2 x = π - arcsin (0.1) + 2 πn + \frac{π}{2}

两边除以

2

\frac{2 x}{2} = \frac{π}{2} - \frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2}

化简

\frac{2 x}{2} = \frac{π}{2} - \frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2}

化简

\frac{2 x}{2} : x

\frac{2 x}{2}

数字相除:

\frac{2}{2} = 1

= x

化简

\frac{π}{2} - \frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2} : πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

\frac{π}{2} - \frac{arcsin ( 0.1 )}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2}

对同类项分组

= \frac{π}{2} + \frac{2 πn}{2} + \frac{\frac{π}{2}}{2} - \frac{arcsin ( 0.1 )}{2}

\frac{2 πn}{2} = πn

\frac{2 πn}{2}

数字相除:

\frac{2}{2} = 1

= πn

\frac{\frac{π}{2}}{2} = \frac{π}{4}

\frac{\frac{π}{2}}{2}

使用分式法则:

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

= \frac{π}{2 \cdot 2}

数字相乘:

2 \cdot 2 = 4

= \frac{π}{4}

= \frac{π}{2} + πn + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

对同类项分组

= πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

x = πn + \frac{π}{4} + \frac{arcsin ( 0.1 )}{2}, x = πn + \frac{π}{2} + \frac{π}{4} - \frac{arcsin ( 0.1 )}{2}

以小数形式表示解

x = πn + \frac{π}{4} + \frac{0.10016 \dots}{2}, x = πn + \frac{π}{2} + \frac{π}{4} - \frac{0.10016 \dots}{2}

作图

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