NCERT Class 11 Mathematics Solutions: Chapter 3 –Trigonometric Functions Miscellaneous Exercise Part 4

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In figure trignometric identities are shown.

Trignometric Identities

In figure trignometric identities are shown.

1. Find for in quadrant III

Answer:

Here, is in quadrant III.

i.e.,

So, are negative, where as is positive.

It is given that

Now,

So, the respective values of