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[m]y`=\frac{1}{2}(tgx)`+\frac{(x)`\cdot cosx-x\cdot (cosx)`}{cos^2x}-\frac{1}{10}\cdot (x^10)`+(\frac{6}{7})`[/m] [m]y`=\frac{1}{2}\cdot \frac{1}{cos^2x}+\frac{ cosx-x\cdot (-sinx)}{cos^2x}-\frac{1}{10}\cdot 10x^9+0[/m] [m]y`=\frac{1+2cosx+2x\cdot sinx}{2cos^2x}-x^9[/m]