Trig Identities to Know

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9 Terms

1
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cos²(x)+sin²(x)=

1

2
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1+tan²(x)=

sec²(x)=

3
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1+cot²(x)=

csc²(x)=

4
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sin(a+b)=

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

5
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cos(a+b)=

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

6
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sin(2x)=

2sin(x)cos(x)=

7
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cos(2x)

cos²(x)-sin²(x)

8
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sin²(x)=

(1-cos(2x))/2

9
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cos²(x)=

(1+cos(2x))/2