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Trig Identities

Trig Identities Needed for Calculus

QuestionAnswer
tan x sin x / cos x
sec x 1 / cos x
csc x 1 / sin x
cot x cos x / sin x
sin^2 x + cos^2 x 1
1 + tan^2 x sec^2 x
sin(x+y) sin x cos y + cos x sin y
sin(x-y) sin x cos y - cos x sin y
cos(x+y) cos x cos y - sin x sin y
cos(x-y) cos x cos y + sin x sin y
sin(2x) 2sin x cos x
cos(2x) cos^2 x - sin^2 x
sin^2 x (1 - cos (2x))/2
cos^2 x (1 + cos (2x))/2
cot x 1 / tan x
cos(2x) 2cos^2 x - 1
cos(2x) 1 - 2 sin^2 x
Created by: mgross144
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