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Find dy/dx at x=0, y=(4x8+x6+3x5+ x3+3)(x3+3x2+18x+9) ...
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Find dy/dx at x=-1/2, y=(x2-1)(x2+x+1) (x2-x+1) ...
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find the sum of the roots of the eqn. dy/dx=0, where y=(x9+x7+x5+ x4+x2+1)(x3+1) ...
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lim(x→0) x[x] where [x] is greatest integer function ...