trig identities

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16 Terms

1
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sec x

1/cos x

2
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csc x

1/sin x

3
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cot x

1/tan x

4
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sin(a+B)

sinacosB + cosasinB

5
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sin(a-B)

sinacosB - cosasinB

6
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cos(a+B)

cosacosB + sinasinB

7
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cos(a-B)

cosacosB - sinasinB

8
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sin²x + cos²x

1

9
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1 + tan²x

sec²x

10
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1 + cot²x

csc²x

11
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tan x

sin x/cos x

12
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cot x (quotient identity)

cos x/sin x

13
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sin (2x)

2sinxcosx

14
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cos (2x)

cos²x - sin²x

15
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cos (2x)

1 - 2sin²x

16
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cos (2x)

2cos²x - 1