emma7823 emma7823
  • 31-10-2021
  • Mathematics
contestada

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

Respuesta :

ferrybukantoro
ferrybukantoro ferrybukantoro
  • 31-10-2021

Step-by-step explanation:

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

= cos 15x

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