эх эх ду ду аnd hеnсе find 5 If z = cosh 2x sin 3y and u=e*(1 + y) and v=2ye-*, determine дz дz expressions for and диду

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эх эх ду ду аnd hеnсе find 5 If z = cosh 2x sin 3y and u=e*(1 + y) and v=2ye-*, determine дz дz expressions for and диду ди” ду? Әи ду 6 If z=f(u, v) where u = {(x2 - y) and v = xy, prove that #2 22 ?? ? Pz az 2u +4y +2 ди2 ду? Әиду ди" 7 Locate the stationary points of the following functions. Determine the nature of the points and calculate the critical function values. (а) z=y? + xy +х2 + 4у – 4х +5 (b) =y* + xy + 2х + Зу +6 (c) z= 3ху — бу? – 3х2 + бу + 6х +7. Әx2 ду? -