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Express each of the following as the sum...

Express each of the following as the sum or difference of sines and cosines: `\ 2cos7thetacos3theta`

Text Solution

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`2cos 7θcos 3θ`
`2cos A cosB `
`=cos(A+B)+cos(A−B)`
`⇒2cos7θ cos3θ`
`=cos(7θ+3θ)+cos(7θ−3θ)`
`=cos 10θ+cos4θ`
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