# NCERT Class 11 Mathematics Solutions: Chapter 3 –Trigonometric Functions Miscellaneous Exercise Part 3

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1. Prove that:

Answer:

L.H.S.

8. Find , if in quadrant II

Answer:

Here, is in quadrant II.

I.e.,

So, are lies in first quadrant.

It is given that

As is in quadrant II, is negative.

Now,

So, the respective values of .