AP Calculus AB Trig Identities

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7 Terms

1
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sin2x=

2sinxcosx

2
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cos2x=

cos²x-sin²x

3
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tan2x=

2tanx/(1-tan²x)

4
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sin(x+-y)=

sinx cosy +- cosx siny

5
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cos(x+-y)=

cosx cosy +- sinx siny

6
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tan(x+-y)=

tanx ± tany/(1 ∓ tanx tany)

7
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What do you do if it’s a different variable or if its theta in these equations?

Sub in theta or the variable directly into the equation