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Popular >

sin^2(x)> 3/4

Solution

sin^{2} (x) > \frac{3}{4}

Solution

\frac{π}{3} + 2 πn < x < \frac{2 π}{3} + 2 πn or - \frac{2 π}{3} + 2 πn < x < - \frac{π}{3} + 2 πn

Interval Notation

(\frac{π}{3} + 2 πn, \frac{2 π}{3} + 2 πn) \cup (- \frac{2 π}{3} + 2 πn, - \frac{π}{3} + 2 πn)

Decimal Notation

1.04719 \dots + 2 πn < x < 2.09439 \dots + 2 πn or - 2.09439 \dots + 2 πn < x < - 1.04719 \dots + 2 πn

Solution steps

sin^{2} (x) > \frac{3}{4}

For

u^{n} > a

, if

n

is even then

sin (x) < - \frac{3}{4} or sin (x) > \frac{3}{4}

\frac{3}{4} = \frac{3}{2}

\frac{3}{4}

Apply radical rule:

assuming

a \geq 0, b \geq 0

= \frac{3}{4}

4 = 2

4

Factor the number:

4 = 2^{2}

= 2^{2}

Apply radical rule:

2^{2} = 2

= 2

= \frac{3}{2}

sin (x) < - \frac{3}{2} or sin (x) > \frac{3}{2}

sin (x) < - \frac{3}{2} : - \frac{2 π}{3} + 2 πn < x < - \frac{π}{3} + 2 πn

sin (x) < - \frac{3}{2}

For

sin (x) < a

, if

- 1 < a \leq 1

then

- π - arcsin (a) + 2 πn < x < arcsin (a) + 2 πn

- π - arcsin (- \frac{3}{2}) + 2 πn < x < arcsin (- \frac{3}{2}) + 2 πn

Simplify

- π - arcsin (- \frac{3}{2}) : - \frac{2 π}{3}

- π - arcsin (- \frac{3}{2})

arcsin (- \frac{3}{2}) = - \frac{π}{3}

arcsin (- \frac{3}{2})

Use the following property:

arcsin (- x) = - arcsin (x)

arcsin (- \frac{3}{2}) = - arcsin (\frac{3}{2})

= - arcsin (\frac{3}{2})

Use the following trivial identity:

arcsin (\frac{3}{2}) = \frac{π}{3}

arcsin (\frac{3}{2})

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= \frac{π}{3}

= - \frac{π}{3}

= - π - (- \frac{π}{3})

Simplify

- π - (- \frac{π}{3})

Apply rule

- (- a) = a

= - π + \frac{π}{3}

Convert element to fraction:

π = \frac{π 3}{3}

= - \frac{π 3}{3} + \frac{π}{3}

Since the denominators are equal, combine the fractions:

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

= \frac{- π 3 + π}{3}

Add similar elements:

- 3 π + π = - 2 π

= \frac{- 2 π}{3}

Apply the fraction rule:

\frac{- a}{b} = - \frac{a}{b}

= - \frac{2 π}{3}

= - \frac{2 π}{3}

Simplify

arcsin (- \frac{3}{2}) : - \frac{π}{3}

arcsin (- \frac{3}{2})

Use the following property:

arcsin (- x) = - arcsin (x)

arcsin (- \frac{3}{2}) = - arcsin (\frac{3}{2})

= - arcsin (\frac{3}{2})

Use the following trivial identity:

arcsin (\frac{3}{2}) = \frac{π}{3}

arcsin (\frac{3}{2})

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= \frac{π}{3}

= - \frac{π}{3}

- \frac{2 π}{3} + 2 πn < x < - \frac{π}{3} + 2 πn

sin (x) > \frac{3}{2} : \frac{π}{3} + 2 πn < x < \frac{2 π}{3} + 2 πn

sin (x) > \frac{3}{2}

For

sin (x) > a

, if

- 1 \leq a < 1

then

arcsin (a) + 2 πn < x < π - arcsin (a) + 2 πn

arcsin (\frac{3}{2}) + 2 πn < x < π - arcsin (\frac{3}{2}) + 2 πn

Simplify

arcsin (\frac{3}{2}) : \frac{π}{3}

arcsin (\frac{3}{2})

Use the following trivial identity:

arcsin (\frac{3}{2}) = \frac{π}{3}

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= \frac{π}{3}

Simplify

π - arcsin (\frac{3}{2}) : \frac{2 π}{3}

π - arcsin (\frac{3}{2})

Use the following trivial identity:

arcsin (\frac{3}{2}) = \frac{π}{3}

x 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 arcsin (x) 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} arcsin (x) 0^{\circ} 3 0^{\circ} 4 5^{\circ} 6 0^{\circ} 9 0^{\circ}

= π - \frac{π}{3}

Simplify

π - \frac{π}{3}

Convert element to fraction:

π = \frac{π 3}{3}

= \frac{π 3}{3} - \frac{π}{3}

Since the denominators are equal, combine the fractions:

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

= \frac{π 3 - π}{3}

Add similar elements:

3 π - π = 2 π

= \frac{2 π}{3}

= \frac{2 π}{3}

\frac{π}{3} + 2 πn < x < \frac{2 π}{3} + 2 πn

Combine the intervals

- \frac{2 π}{3} + 2 πn < x < - \frac{π}{3} + 2 πn or \frac{π}{3} + 2 πn < x < \frac{2 π}{3} + 2 πn

Merge Overlapping Intervals

\frac{π}{3} + 2 πn < x < \frac{2 π}{3} + 2 πn or - \frac{2 π}{3} + 2 πn < x < - \frac{π}{3} + 2 πn

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