Double Angles Formulas
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Useful trig double angle formulas to save you time when integrating.
Last updated 1:59 AM on 4/27/24
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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)
Note 
Flashcards (33)