1.

If2 sin^(2) x - 5 sin x cos x - 8 cos ^(2) x = -then

Answer»

`x = {n pi + TAN ^(-1) (2), n in Z} cup{m pi + tan ^(-1)((-3)/(4)), m in Z}`
`x = n pi + tan ^(-1) (3), n in Z`
`x = n pi + tan^(-1) ((-4)/(3)), n in Z`
`x = n pi + tan^(-1) (4), n in Z`

Answer :A


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