This is a draft cheat sheet. It is a work in progress and is not finished yet.
Reciprocal identities
csc x = 1/sin x
sec x = 1/cos x
cot x = 1/tan x
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Cotangent/Tangent
tan x = sin x/cos x
cot x = cos x/sin x
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Sum & Difference Identities
sin sum/differences...
cos sum/differences...
tan sum/differences...
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Use these to find (a) any trig function, given two known functions or (b) a 15*pi function that isn't on the 16-point unit circle.
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Pythagorean Identities
sin2x + cos2x = 1
tan2x + 1 = sec2x
1 + cot2x = csc2x
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You can convert the first identity into the second and third by dividing both sides by cos2 x or sin2 x, respectively.
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