Trig Identities

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Last updated 5:07 PM on 5/20/26
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9 Terms

1
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sin2x+cos2x =

1

2
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1 + tan2x =

sec2x

3
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1+cot2x =

csc2x

4
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sin(a+b) =

sin(a)cos(b)+cos(a)sin(b)

5
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sin(a-b) =

sin(a)cos(b)-cos(a)sin(b)

6
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cos(a+b) =

cos(a)cos(b)-sin(a)sin(b)

7
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cos(a-b) =

cos(a)cos(b)+sin(a)sin(b)

8
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sin(2x) =

2(sinx)(cosx)

9
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cos(2x) =

cos2x-sin2x = 1-2sin2x = 2cos2x-1