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Solve the equation 2x^(2)+5x-12=0...

Solve the equation `2x^(2)+5x-12=0`

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(i) `(dy)/(dx)=x^(2)(cos x)+(2x)(sin x)=x^(2) cos x+ 2xsin x`
(ii) `(dy)/(dx)=4[(e^(x))(cos x)+(e^(x))(-sin x)]=4e^(x)[cos x-sin x]`
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