anthony983
03.11.2021 •
Mathematics
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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Ответ:
Step-by-step explanation:
cos 9x cos 6x - sin 9x sin 6x = cos (9x+6x)
= cos 15x
Ответ: