trig identities

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17 Terms

1
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csc x=

1/sin

2
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sec x=

1/cos

3
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cot x=

1/tanx

4
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tan x=

sinx/cosx

5
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cotx=

cosx/sinx

6
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sin^2x+cos^2x=

1

7
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tan^2 x+1=

sec^2 x

8
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1+cot^2 x=

csc^2 x

9
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sin u cos v

1/2 [sin (u+v) + sin (u-v)]

10
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cos u sin v

1/2 [sin (u+v)- sin (u-v)]

11
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cos u cos v

1/2[cos (u+v)+ cos (u-v)]

12
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sin u sin v

1/2 [cos (u+v)- cos (u+v)]

13
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sin 2x

2sin x cosx

14
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cos2x

cos^2 x- sin^2 x; = 1-2sin^2x; = 2 cos^2 x-1

15
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tan ² x

(1-cos2x)/(1+cos2x)

16
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sin²θ

1/2(1 − cos 2θ)

17
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cos²θ

1/2(1+cosθ)