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If`y=sqrt(logx+sqrt(cosx+sqrt(cosx+...tooo))),`provethat `(dy)/(dx)=(sinx)/(1-2y)` |
Answer» `y = sqrt(cosx+sqrt(cosx+sqrt(cosx+...oo)))` `=>y = sqrt(cosx+y)` `=>y^2 = cosx+y` Differntiating both sides w.r.t. `x`, `=>2y dy/dx = -sinx+dy/dx` `=>dy/dx(2y-1) = -sinx` `=>dy/dx = sinx/(1-2y)` |
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