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Precalculus TAF-1 – TAF-2 SUM, DIFFERENCE, AND DOUBLE-ANGLE FORMULAS HOMEWORK I. Simplify each of the following expressions. If possible, evaluate them. 1) cos 3x cos 7x – sin 3x sin 7x 3) 1- 2 sin2 5) sin 118 cos 97 - cos 118 sin 97 7) 9) 7p 8 12 tan 3f 1 - tan 3f 2 2 sin 7x cos 7x 11) sin 83 cos 97 + cos 83 sin 97 MPH/CR 1/12 2) 4) 2 sin 25 cos 25 tan 263 + tan 37 1 - tan 263 tan 37 6) cos2 7x - sin2 7x 8) cos 2p 3 cos 5p 12 + sin 2p 3 sin 5p 12 10) 6 cos2 5a - 3 12) 2tan 157.5 1 - tan2 157.5 1 Precalculus II. If tan A = -7 24 (QIV) and sec B = -5 3 ( < B < 2), evaluate the following. 1) sin (B – A) 2) cos (A + B) 3) tan (A – B) 4) sin 2B 5) cos 2A 6) tan 2B III. æ 2p ö Evaluate tan ç - B÷ if tan B = -2. è 3 ø IV. Verify each of the following trigonometric identities. 1) 3) 5) cos ( - x) = - cos x sin 2C cos C 2 = 2 tan C (1 + tan2 y) (cos 2y – 1) = -2 tan2 y MPH/CR 1/12 2) tan (x + ) = tan x 4) tan u sin 2u = 2 sin2 u 6) cos 2x cos x + sin x = cos x – sin x 2 Precalculus TAF-1 – TAF-2 SUM, DIFFERENCE, AND DOUBLE-ANGLE FORMULAS HOMEWORK ANSWERS 1) cos 10x 2) sin 50 3) 5) sin 21 6) cos 14x 7) 9) sin 14x 10) 3 cos 10a 1) III. -117 2) 25 -4 5 3) 2 4) 2 6 tan 6f 8) 44 4) 24 25 2 2 12) -1 11) 0 -117 - 3 5) 527 625 6) -24 7 -8 + 5 3 11 MPH/CR 1/12 3