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MATH SOLVE
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Write the expression as the sine, cosine, or tangent of an angle. cos 8x cos 2x - sin 8x sin 2x
4 months ago
Q:
Write the expression as the sine, cosine, or tangent of an angle. cos 8x cos 2x - sin 8x sin 2x
Accepted Solution
A:
Sum and Difference Formula for Cosine: cos(α±β)= cosαcosβ ∓ sinαsinβ
cos(8x+2x)=cosαcosβ-sinαsinβ
cos(10x)=cosαcosβ-sinαsinβ