Suggested: (x+y)2-(x-y)2 - verify that x3+y3+z3-3xyz=1/2(x+y+z) (x-y)2+(y-z)2+(z-x)2 - 10/x+y+2/x-y=4 15/x+y-5/x-y=-2 - if (x+iy)^3=u+iv then show that u/x+v/y=4(x^2-y^2) - u=x^2 tan^-1(y/x)-y^2 tan^-1(x/y) - x-y+z=4 2x+y-3z=0 x+y+z=2 - z(x+y)=x^2+y^2 show that - 2/x+3/y=13 5/x-4/y=-2 - find the maxima and minima of f(x y)=x^4+y^4-2x^2+4xy-2y^2 - the graph of x^2+x+y^2+y=199/2 - if u=sin^-1(x^2+y^2/x+y) - cosx+cosy= 2 cos (x+y/2)cos(x-y/2) - (xy+x)dx=(x^2 y^2+x^2+y^2+1)dy - if u=log(x^2+y^2/x+y) - (x+y)2 (x y)2 Browse related:
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