Trig Identities Pre-Cal

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17 Terms

1
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sin²x+cos²x=

1

2
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1+cot²x=

csc²x

3
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1+tan²x=

sec²x

4
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which identities are even?

cos, sec

5
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cos(a+b)=

cos a cos b - sin a sin b

6
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cos(a-b)=

cos a cos b + sin a sin b

7
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sin(a+b)=

sin a cos b + cos a sin b

8
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sin(a-b)=

sin a cos b - cos a sin b

9
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sin(2x)=

2 sin x cos x

10
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cos(2x)=

cos² x - sin² x

1-2sin²x

2cos²x-1

11
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tan(2x)=

2tanx/1-tan²x

12
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sin(a/2)=

±√((1-cosa/2)

13
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cos(a/2)=

±√((1+cosa)/2)

14
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tan(a/2)=

±√(1-cosx)/(1+cosx)

15
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sin²x=

(1 - cos(2x))/2

16
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cos²x=

(1 + cos(2x))/2

17
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tan²x=

1-cos(2x)/1+cos(2x)