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Trig identities

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devilehu's version from 2016-10-12 00:44

Section

Question Answer
sin^2 + cos^2 = 1
tan^2 + 1 = sec^2
cot^2 + 1 =csc^2
cos^2 - sin^2cos2x
2(cos)(sin)sin2x
cos^21/2(1+cos2x)
sin^21/2(1-cos2x)
sin(x+-y)sinxcosy +- cosxsiny
cos(x+-y)cosxcosy -+ sinxsiny
sin(-x)-sin(x)
cos(-x)cos(x)
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