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C4 Trig Identities

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weyapafa's version from 2015-05-19 11:51

Section

Question Answer
sin²(x) + cos²(x)1
cot²(x) + 1cosec²(x)
tan²(x) + 1sec²(x)
sin(2x)2sin(x)cos(x)
cos(2x)cos²(x) - sin²(x) = 1 - 2sin²(x)
tan(2x)2tan(x) / 1-tan²(x)
memorize

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