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

User Mjh
by
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1 Answer

2 votes

Answer:

cos6x.

Explanation:

We use the identity

cosAcosB - sinAsinB = cos(A+B)

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

= cos6x.

User Augustin R
by
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