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Minimum value of y=256sin^2x+324cos e c^...

Minimum value of `y=256sin^2x+324cos e c^2x,AAx in R` is (a) 432 (b) 504 (c) 576 (d) 776

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`y=256sin^2x+324cosec^2x`
`y=(16sinx-18cosecx)^2+576`
`y>=576`.
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