$x\frac{dy}{dx}=y+x^3\sin\left(x\right)$

$132,28+5,103+42,07$

$14^2+4$

$\frac{\sin\:\left(x-1\right)}{\sin\:\left(x+1\right)}\:=\:\frac{-\cos\:^2\:\left(x\right)}{\left(\sin\:\left(x+1\right)\right)^2}$

$\lim_{x\to\infty}\left(1+\frac{11}{x}\right)^{\frac{x}{12}}$

$\lim_{x\to1}\left(\frac{\left(x+3\right)\left(x-1\right)}{x^2-1}\right)$

$a+c=0$