7.5 and 7.6

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Last updated 2:29 AM on 9/25/26
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6 Terms

1
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Sine (A + B) formula

sine(A + B) = sine A cos B + cos A sine B

2
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Memory aid for sine(A + B) formula

For sine A + B, remember 'abab cosine in the middle' which refers to sine A cos B + cos A sine B.

3
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Cosine (A + B) formula

cosine(A + B) = cos A cos B - sine A sine B

4
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Memory aid for cosine(A + B) formula

For cosine, 'plus, cosine in the front, ab - ab' refers to cos A cos B - sine A sine B.

5
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Sine double angle formula

sin(2θ) = 2 sine θ cos θ

6
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Cosine double angle formula

cos(2θ) = cos²θ - sin²θ