Pre-Calculus, 9th edition
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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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