Precalc Identities
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Last updated 3:38 AM on 3/26/25
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5 Terms
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Pythagorean Identities
sin2x+cos2x=1
1+tan2x=sec2x
1+cot2x=csc2x
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Sum/Difference Identities for COSINE
cos(A+B)=cosAcosB−sinAsinB
cos(A−B)=cosAcosB+sinAsinB
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Sum/Difference Identities for SINE
sin(A+B)=sinAcosB+cosAsinB
sin(A−B)=sinAcosB−cosAsinB
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Sum/Difference Identities for TANGENT
tan(A+B)= (tanA+tanB) / (1-tanAtanB)
tan(A-B)=(tanA-tanB) / (1+tanAtanB)
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Even/Odd Functions
sin(θ) = sinθ —> ODD
tan(-θ) = -tanθ —> ODD
cos(-θ) = cosθ —> EVEN
Note 
Flashcards (127)