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131

Step-by-step Answer
PAGE: 269SET: ExercisesPROBLEM: 131
Please look in your text book for this problem Statement

The trigonometric expression is

Use double - angle formula: .

Simplify .

Use inverse trigonometric functions: .

.

Simplify .

Let , then .

.

From Pythagorean theorem,

.

Substitute in .

.

Substitute and in equation (1).

.



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