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" If "sin^(2)x+sin x cos x-6cos^(2)x=0" ...

`" If "sin^(2)x+sin x cos x-6cos^(2)x=0" and "-(pi)/(2)ltxlt0," then value of "cos2x" is "`
`-3/5`
`3/5`
`-4/5`
`4/5`

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