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Pre-Calculus

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10 Terms

1
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sin²x + cos²x = 1

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1 + tan²x = sec²x

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1 + cot²x = csc²x

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Example of even-odd identities

Sin(-x) →-sinx

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Sin double angle

Sin(2x) = 2sinx cosx

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Cosine double angle

Cos(2x) = cos²x - sin²x

2cos²x -1 or 1 - 2sin²x

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Sums: sine

Sin A, cos B+ cos A, sin B

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Sum:Cosine

CosA cosB - sinA sin B

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Difference: Cosine sine

Opposite signs of sum formula

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