Which expression completes the identity cos u cos v=

2 answers:

4 0

Cos(u+v) = cosu.cosv - sinu.sinv and cosu.cosv= cos(u+v) + sinu.sinv
or
cos(u - v) = cosu.cosv + sinu.sinv and cosu.cosv= cos(u+v) - sinu.sinv

4 0

A is the correct answer.

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