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sin 7 theta * sin theta+sin11theta * sin...

`sin 7 theta * sin theta+sin11theta * sin 3theta=` A) `sin 4 theta * sin 10theta` B) `cos 4 theta * cos 10 theta`C) `sin 8 theta * sin 4 theta`D)`cos 8 theta * cos 14 theta`

A

`sin 4 theta * sin 10theta`

B

`cos 4 theta * cos 10 theta`

C

`sin 8 theta * sin 4 theta`

D

`cos 8 theta * cos 14 theta`

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The correct Answer is:
A
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