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If y = cos x - sinx, evaluate x, in the range 0x where find the dyif xy + 2xy = 4xy at (-1,-2)

If y = cos x - sinx, evaluate x, in the range 0x where find the dyif xy + 2xy = 4xy at (-1,-2) > dx Given that z = f(x, y) = (2x + y)e dz (i) and (ii) ax find find (i) z dx is zero.

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