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Find the principal value of cos^(-1)(sqr...

Find the principal value of `cos^(-1)(sqrt3/2)`.

Text Solution

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Let `cos^(-1)(sqrt3/2)=theta`. Then ,`costheta =sqrt3/2=cos pi/6.`
We know that the range of the principal value branch of `cos^(-1)` is `[0,pi]` and `cos(pi/6)= sqrt3/2`.
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