Trig Identities
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The confusing ones
Last updated 8:25 PM on 3/25/25
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9 Terms
1
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Cotangent
Cos/Sin
2
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Secant
1/Cos
3
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Cosecant
1/Sin
4
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Cofunction identities
cos(π/2 - x) = sin, same when switched (can also use tan and cot)
5
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Add the sin of two angles
cos(x) sin (y) + sin(x) cos(y)
6
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Subtract the sin of two angles
sin(x) cos (y) - cos(x) sin(y)
7
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Add/subtract cos of two angles
Do opposite sign, cos ± sin
8
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Sin 2x
2 sin (x) cos(x)
9
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Cos 2x
cos²(x) - sin²(x)
Note 
Flashcards (96)