Double Angles Formulas

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Useful trig double angle formulas to save you time when integrating.

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10 Terms

1
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1 =

sin²(x) + cos²(x)

2
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csc²(x) =

1 + cot²(x)

3
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sec²(x) =

tan²(x) + 1

4
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2sin(x)cos(x) =

sin(2x)

5
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cos²(x) - sin²(x) =

cos(2x)

6
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1 - 2sin²(x) =

cos(2x)

7
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2cos²(x) - 1 =

cos(2x)

8
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2tan(x) / (1 - tan²(x)) =

tan(2x)

9
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(1 - cos(2x)) / 2 =

sin²(x)

10
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(1 + cos(2x)) / 2 =

cos²(x)