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Prove that: (cos4x+cos3x+cos2x)/(s in4x+...

Prove that: `(cos4x+cos3x+cos2x)/(s in4x+s in3x+s in2x)=cos3x`

Text Solution

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The correct Answer is:
`=(cos3x)/("sin"3x)=cot3x=RHS`
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