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sinx,cosx
\frac{f(x)-f(a)}{x-a}=f'(a)\Leftrightarrow\ f(x)=f(a)-af'(a)+f'(a)x=A+Bx \ \ f(x)
-\frac{n}{x^{n+1}}=x^{-(n+1)}
f_k(x)=a_k(x-c)^k;\ x
f_k(x)=\frac{f^{(k)}(a)}{k!}(x-a)^k;