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4 а) y' = (cosx)'*x^(8/3) + cosx*(x^(8/3))' = -sinx*x^(8/3) +cosx*8/3* x^(8/3-1) = -sinx*x^(8/3) +cosx*8/3*x^(5/3)
б)![y' = frac{(x+ e^{x})'(x-e^{x})-(x+e^{x})(x-e^{x})'}{(x-e^{x})^{2} } = frac{(1+e^{x})(x-e^{x})-(x+e^{x})(1-e^{x})}{(x-e^{x})^{2}} y' = frac{(x+ e^{x})'(x-e^{x})-(x+e^{x})(x-e^{x})'}{(x-e^{x})^{2} } = frac{(1+e^{x})(x-e^{x})-(x+e^{x})(1-e^{x})}{(x-e^{x})^{2}}](https://tex.z-dn.net/?f=y%27+%3D++frac%7B%28x%2B+e%5E%7Bx%7D%29%27%28x-e%5E%7Bx%7D%29-%28x%2Be%5E%7Bx%7D%29%28x-e%5E%7Bx%7D%29%27%7D%7B%28x-e%5E%7Bx%7D%29%5E%7B2%7D++%7D+%3D++frac%7B%281%2Be%5E%7Bx%7D%29%28x-e%5E%7Bx%7D%29-%28x%2Be%5E%7Bx%7D%29%281-e%5E%7Bx%7D%29%7D%7B%28x-e%5E%7Bx%7D%29%5E%7B2%7D%7D+)
в)![y' =frac{1}{3} arctg^{- frac{2}{3}} (lnx)* frac{1}{1+(lnx)^{2} } * frac{1}{x} y' =frac{1}{3} arctg^{- frac{2}{3}} (lnx)* frac{1}{1+(lnx)^{2} } * frac{1}{x}](https://tex.z-dn.net/?f=+y%27+%3Dfrac%7B1%7D%7B3%7D+arctg%5E%7B-+frac%7B2%7D%7B3%7D%7D+%28lnx%29%2A+frac%7B1%7D%7B1%2B%28lnx%29%5E%7B2%7D+%7D+%2A++frac%7B1%7D%7Bx%7D+)
г)![y' = 10^{3-ln3x} *ln10 * (- frac{1}{3x} )*3 y' = 10^{3-ln3x} *ln10 * (- frac{1}{3x} )*3](https://tex.z-dn.net/?f=y%27+%3D+10%5E%7B3-ln3x%7D+%2Aln10+%2A+%28-+frac%7B1%7D%7B3x%7D+%29%2A3)
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