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2(1-2sin^2 7theta)s in3theta is equal to...

`2(1-2sin^2 7theta)s in3theta` is equal to `adot\ s in 17theta-s in 11theta` b. `s in 11theta-s in 17theta` c. `cos 17theta-cos 11theta` d. `cos 17theta+cos 11theta`

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