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PAGE: 352SET: ExercisesPROBLEM: 1
Please look in your text book for this problem Statement

The value of the trigonometric function , and the interval is .

Double-angle formulas : ,

                                         (or) ,

                                         .

Find the value of by using Pythagorean identity.

Pythagorean identity : .

The angle is in the interval .

Since sine function is negative in fourth quadrant, .

The value of .

The value of .

Quotient identity : .

The value of .

The values of , , and .



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