trungkienuong trungkienuong

16-08-2021
Mathematics

contestada

cos5xcosx-sin5xsinx=??????????????????

Respuesta :

cwrw238 cwrw238

17-08-2021

Answer:

cos6x.

Step-by-step explanation:

We use the identity

cosAcosB - sinAsinB = cos(A+B)

so cos5xcosx - sin5xsinx = cos(5x + x)

= cos6x.

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