Trig Identities

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The confusing ones

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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(Ď€/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)