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39

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PAGE: 482SET: ExercisesPROBLEM: 39
Please look in your text book for this problem Statement

The expression is , is in second quadrant.

(a) Find .

Apply trigonometric identity: .

Since is in second quadrant, .

.

(b) Find .

Apply sum formula: .

Substitute and .

.

(c) Find .

Apply difference formula: .

Substitute and .

.

(d) Find .

Apply sum formula: .

Substitute .

.

.

(a) .

(b) .

(c) .

(d) .



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