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5 Cards in this Set

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  • Back

what are the Pythagorean Identities?

Sin^2 (u) + Cos^2 (u) = 1




1 + Tan^2 (u) = Sec^2 (u)




1+ Cot^2 (u) = Csc^2 (u)

What are the identities that involve pi/2?

Sin ( pi/2 - u) = Cos (u)


Csc ( pi/2 - u) = Sec (u)


Tan ( pi/2 - u) = Cot (u)

What are the double angle Identities?

sin 2(u) = 2sin(u)cos(u)




cos 2(u) = cos^2(u)-sin^2(u)


= 2cos^2(u) - 1


= 1- sin^2(u)


tan 2(u) = 2tan(u)/1-tan^2(u)

Sum and difference identities for tangent

+ tan(a) + tan (b)


1-tan(a)tan(b)




- tan(a) - tan(b)


1+tan(a)tan(b)

Half angle Identities