Trig Formulas

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Last updated 5:53 PM on 6/3/26
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12 Terms

1
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sin²x & cos²x

sin²x+cos²x=1

2
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tan²x

1+tan²x=sec²x

3
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cot²x

1+cot²x=csc²x

4
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tan(A+B)

tan(A-B)

tan A+tan B/ 1-tanAtanB

tan A-tanB/1+tanAtanB

5
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sin(A+B)

sin(A-B)

sinAcosB+cosAsinB

sinAcosB-cosAsinB

6
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cos(A+B)

cos(A-B)

cosAcosB-sinAsinB

cosAcosB+sinAsinB

7
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tan2x

2tanx/1-tan²x

8
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sin2x

2sinxcosx

9
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cos2x

1-2sin²x

10
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tan1/2x

Square root of 1-cosx/1+cosx

11
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cos 1/2x

Square root of 1+cosx/2

12
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sin1/2x

Square root of 1-cosx/2