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MATH 175: Chapter 7 Review Analytic Trigonometry - The Learning ...

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25)<br />

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cos( x y) cos xcos y sin xsin y 1/(cos x cos y) cos x cos y sin xsin y 1 tan x tan y<br />

cos( x y) cos xcos y sin xsin y 1/(cos x cos y) cos x cos y sin xsin y 1 tan x tan y<br />

2 2<br />

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sin<br />

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2<br />

sin<br />

2<br />

2<br />

33) sin(4x) = 2 sin(2x) cos(2x) = (4 sin x cos x)(2 cos x - 1).<br />

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48) 1.06<br />

49) 48.6°, 131.4°<br />

REV 12/01/2010 6

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