Answer :

We need to find the value of:

Let us simplify the trigonometric function.

We can write as:


Since, lies on IV Quadrant and cosine is positive in IV Quadrant.

And since, lies on IV Quadrant and sine is negative in IV Quadrant.

Using property of inverse trigonometry,

sin-1(sin A) = A and cos-1(cos A) = A


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