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Let y = (a sin x+ (b +c) cos x ) e ^(x+d...

Let y = `(a sin x+ (b +c) cos x ) e ^(x+d),` where a,b,c and d are parameters represent a family of curves, then differential equation for the given family of curves is given by `y'' -alpha y'+betay=0, ` then `alpha+ beta =`

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