$\left(5x+1\right)^2+5\left(x-1\right)^2$

$-2+-0.1$

$\frac{\frac{k^3-1^3}{k+1}}{\frac{k^2+kl+l^2}{\left(k+l\right)^2}}$

$\int x\cdot sen\left(x\right)\cdot\cos\left(nx\right)dx$

$\lim_{x\to0}\left(\frac{-5\sin\left(9x^3\right)}{-2x}\right)$

$\left(d^{-2}\right)\left(d^{-4}\right)$

$\int_7^{14}8.3e^{-.029x}dx$