Suggested: y-cosy=x - (cosx)y=(cosy)x - cos(x+y)=cosx cosy-sinx siny - cos(x+y)=cosx cosy-sinx siny proof - cosy=xcos(a+y) find dy/dx - cosx+cosy= 2 cos (x+y/2)cos(x-y/2) - sinx-siny/cosx+cosy=tan x-y/2 - if cosy=xcos(a+y) prove that dy/dx=cos^2(a+y)/sina - prove that (cosx-cosy)^2+(sinx-siny)^2=4sin^2(x-y/2) - prove that u=e^-x(x siny y cosy) is harmonic - if sinx=3/5 and cosy=-12/13 find sin(x+y) - prove that sinx-siny/cosx+cosy=tan x-y/2 - prove that cos(x+y)=cosx.cosy-sinx.siny in easy way - u=e^x(cosy-y sin y) - y cosy x Browse related:
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