Trig Identities

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4 Terms

1
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double angle

sin 2x = 2 sin x cos x

cos 2x = cos2 x − sin2 x

2
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half angle

sin (½ x) = √(1 - cos x)/2

cos(½ x) = √(1+ cos x)/2

3
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pythagorean

sin2(x) + cos2(x) = 1

1 + sec2(x) = tan2(x)

1 + csc2(x) = cot2(x)

4
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hi