If sin- - - 4-5- - 3-2- 2- then the value of cos-2 is equal to- sin- - - 4-5- - 3-2- 2- - cos-2 - - - -

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Basic Inverse Trigonometric Functions

If sinα = - 4...

Question

If $sin α = \frac{- 4}{5}$ , $α \in [\frac{3 π}{2}, 2 π]$ , then the value of $cos \frac{α}{2}$ is equal to

यदि $sin α = \frac{- 4}{5}$ , $α \in [\frac{3 π}{2}, 2 π]$ , तब $cos \frac{α}{2}$ का मान बराबर है

\frac{- 1}{\sqrt{5}}

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\frac{1}{\sqrt{5}}

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\frac{2}{\sqrt{5}}

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\frac{- 2}{\sqrt{5}}

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Solution

The correct option is D $\frac{- 2}{\sqrt{5}}$
solution

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If sinα=−45, α∈[3π2,2π], then the value of cosα2 is equal to यदि sinα=−45, α∈[3π2,2π], तब cosα2 का मान बराबर है

The correct option is D −2√5solution

If $sin α = \frac{- 4}{5}$ , $α \in [\frac{3 π}{2}, 2 π]$ , then the value of $cos \frac{α}{2}$ is equal to

यदि $sin α = \frac{- 4}{5}$ , $α \in [\frac{3 π}{2}, 2 π]$ , तब $cos \frac{α}{2}$ का मान बराबर है

The correct option is D $\frac{- 2}{\sqrt{5}}$
solution