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f(x) is differentiable at x=a prove that `underset(xrarra)Lt ((x+a)f(a)-2af(x))/(x-a)=f(a)-2af'(a)`

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PATHFINDER-DERIVATIVES-QUESTION BANK
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  6. x=sectheta-costheta , y=sec^n theta- cos^n theta show that (dy/dx)^2=(...

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