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Pythagorean Identities
AB
cos(a-b)(cos_a cos_b) + (sin_a sin_b)
cos(a+b)(cos_a cos_b) - (sin_a sin_b)
sin(a-b)(sin_a cos_b) - (cos_a sin_b)
sin(a+b)(sin_a cos_b) + (cos_a sin_b)
sin 2u2(sin_u cos_u)
cos 2u (1st)cos^2 u - sin^2 u
cos 2u (2nd)1 - 2sin^2 u
cos 2u (3rd)2cos^2 u-1
William Bodily

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