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SVEN [57.7K]
3 years ago
8

Cos5xcosx-sin5xsinx=??????????????????

Mathematics
1 answer:
SVEN [57.7K]3 years ago
7 0

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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