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Simplify (double angle formulas)

a) cos3xcos2x + sin3xsin2x

b) 2cos^2 pi/6 - 1

c) 1 - 2sin^2 pi/12

1 answer

(a) sin(a+b) = sina cosb + cosa sinb
(b) cos2θ = 2cos^2θ - 1
(c) cos2θ = 1 - 2sin^2θ

Looks like you just need to review your basic formulas

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