trig identities

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9 Terms

1
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sin² x +cos² x =

1

2
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1 + cot² x=

sec² x

3
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tan² x +1=

csc² x

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)=

2sin(x)cos(x)

9
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cos(2x)

cos²(x)-sin²(x) | 1-2sin²(x) | 2cos²(x)-1