f(x)=f(x_0)+f'(x_0)(x-x_0)+\frac{f''(x_0)}{2!}(x-x_0)^2+\ldots+\\
+\frac{f^{(n)}(x_0)}{n!}(x-x_0)^n+
\frac{f^{(n+1)}(c_x)}{(n+1)!}(x-x_0)^{n+1}