pre calc trig
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Last updated 5:59 PM on 9/11/25
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10 Terms
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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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Note 
Flashcards (39)