Trig Identities Flashcards

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4 Terms

1
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Pythagorean

sin²x + cos²x = 1

tan²x+1 = sec²

1+cot²x = csc²x

2
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Sum

sin(A + B) = sin(A) cos(B) + sin(B) cos(A)

cos(A + B) = cos(A) cos(B) − sin(A) sin(B)

3
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Double-Angle

sin(2x) = 2 sin x cos x

cos(2x) = cos²x-sin²x

cos(2x)=1-2sin²x

cos(2x)=2cos²x-1

4
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Quotients

tan x = sinx/cosx

cot x =cosx/sinx