3.4 sum & difference formulas

# 3.4 sum & difference formulas - Math 114 Section 3.4...

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Math 114 Section 3.4 Sum & Difference Formulas Section 2 A. Sum and Difference Formulas ( 29 β α β α β α sin sin cos cos cos = ± ( 29 β α β α β α sin cos cos sin sin ± = ± ( 29 β α β α β α tan tan 1 tan tan tan ± = ± Find the exact value of the trigonometric function. 1. 12 sin π 2. 12 5 cos π 3. 12 7 tan π 4. 80 sin 20 cos 80 cos 20 sin - 5. 12 7 sin 12 5 sin 12 7 cos 12 5 cos π π π π -

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6. Given, 5 5 cos = α 0 2 < < - α π and 5 4 sin = β π β π < < 2 , find ( 29 β α - sin . 7. Given, 5 3 tan - = α π α π < < 2 and 2 1 sin - = β 2 3 π β π < < , find ( 29 β α + tan . 8. Given, 2 tan - = α π α π < < 2 and 3 sec = β π β π 2 2 3 < < , find ( 29 β α + cos . B. Using Sum and Difference Formulas to Establish Identities 1. θ θ π sin
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