f'(x) = 5x^x * (1 + ln(x)) / ln(x)^2
f'(x) = -5sinx + 5x^4 - e^x
f'(x) = 2x - 2cosx
f'(x) = 2xtgx + x^2 (1 + tg^2(x))
f'(x) = 3x^2 - sinx
f'(x) = 5x^x * (1 + ln(x)) / ln(x)^2
f'(x) = -5sinx + 5x^4 - e^x
f'(x) = 2x - 2cosx
f'(x) = 2xtgx + x^2 (1 + tg^2(x))
f'(x) = 3x^2 - sinx