−4c−9+6+8c-4c-9+6+8c−4c−9+6+8c
5x4−1x+2\frac{5x^4-1}{x+2}x+25x4−1
4ax−9b+3a−12bx4ax-9b+3a-12bx4ax−9b+3a−12bx
dydx−xy=2xy12\frac{dy}{dx}-xy=2xy^{\frac{1}{2}}dxdy−xy=2xy21
040^404
cotx=−3cotx=-3cotx=−3
2x+1x+x2\frac{2x+1}{x+x^2}x+x22x+1
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