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Trig Identities

Reciprocal, Quotient, and Pythagorean Identities

QuestionAnswer
sin u 1 / csc u
cos u 1 / sec u
tan u 1 / cot u
csc u 1 / sin u
sec u 1 / cos u
cot u 1 / cot u
(sin u)^2 + (cos u)^2 1
(tan u)^2 + 1 (sec u)^2
1 + (cot u)^2 (csc u)^2
sin(2u) 2 sin u cos u
cos(2u) (os u)^2 - (sin u)^2 = 2(cos u)^2 - 1 = 1 - 2(sin u)^2
Created by: bbecksmith
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