Trigonometric Identities / Sum + Difference Identities / Double Angle Identities - AP Precalculus

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17 Terms

1
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sin ( u + v )

sin u cos v + cos u sin v

2
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sin ( u

v )

3
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cos ( u + v )

cos u cos v

4
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cos ( u

v )

5
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sin (2A)

2sin(A) cos(A)

6
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cos (2A) { Method 1 }

cos² (A)

7
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cos (2A) { Method 2 }

1

8
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cos (2A) { Method 3 }

2cos² (A)

9
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tan x

sin x/cos x

10
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cot x

cos x/sin x OR 1/tan x

11
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csc x

1/ sin x

12
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sec x

1/ cos x

13
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sin² x + cos²x =

1

14
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tan² x + 1 =

sec² x

15
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cot² x + 1 =

csc² x

16
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sin² x =

1

17
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cos²x =

1