(ln(x) ' =1/x
(uv) ' = u 'v+v'u
(u/v) ' = (u'v-v'u)/v^2
(arctg(x)) ' = 1/(1+x^2)
(sin(x)) ' = -cos(x)
(a^x) ' =a^x * ln(a)
(ln(x) ' =1/x
(uv) ' = u 'v+v'u
(u/v) ' = (u'v-v'u)/v^2
(arctg(x)) ' = 1/(1+x^2)
(sin(x)) ' = -cos(x)
(a^x) ' =a^x * ln(a)