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Write the expression as the sine, cosine, or tangent of an angle. cos 9x cos 6x - sin 9x sin 6x O cos 3x O sin 15x O cos 15x O sin 3x
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Write the expression as the sine, cosine, or tangent of an angle.

cos 9x cos 6x - sin 9x sin 6x

O cos 3x
O sin 15x
O cos 15x
O sin 3x

User Nikdeapen
by
3.6k points

1 Answer

3 votes

Explanation:

cos 9x cos 6x - sin 9x sin 6x = cos (9x+6x)

= cos 15x

User Fermin
by
4.3k points
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