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4 cos^(2)x sinx- 2sin^(2)x = 3 sinx...

`4 cos^(2)x sinx- 2sin^(2)x = 3 sinx`

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`x=npi, x=npi + (-1)^(n), pi/10` and `x=npi -(-1)^(n), (3pi)/10` where n = any integer
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