Trig Identities

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9 Terms

1

cos²θ + sin²θ=

1

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2

1 + tan²θ=

sec²θ

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3

cot²θ+ 1

csc²θ

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4

sin(a±b)=

sin a cos b ± cos a sin b

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5

cos (a±b)=

cos a cos b F sin a sin b

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6

sin (θ+θ)=

sinθ cosθ + cosθ sinθ

2 sin θ cos θ

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7

sin(2θ)=

2 sinθ cosθ

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8

cos (θ+θ)=

cosθ cosθ - sinθ sinθ

cos²θ - sin²θ

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9

cos (2θ)=

cos²θ - sin²θ

2cos²θ-1

1-sin²θ

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