trig identies

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Pre-Calculus

AP Precalculus

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12 Terms

1
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sin²x + cos²x = 1

identity sin and cos

2
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1 + tan²x = sec²x

identity tan and sec

3
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1 + cot² = csc²x

identity cot and csc

4
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sin(a±b)

sinacosb ± cosasinb

5
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cos(a±b)

cosacosb -/+ sinasinb

6
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tan(a±b)

(tana - tanb)/1 -/+ tanatanb

7
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sin2A

2sinAcosA

8
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tan2A

2tanA/1 - tan²A

9
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cos2A

cos²A - sin²A

2cos²A - 1

1 - 2sin²A

10
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sinA/2

± sqrt(1 - cosA)/2

11
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cosA/2

± sqrt(1+cosA)/2

12
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tanA/2

±sqrt(1-cosA)/(1+cosA)

(1-cosA)/sinA

sinA/(1+cosA)