$\left(-2x\right).\left(-x^2-1\right)$

$-\frac{x+6}{7}<4$

$\frac{8x+2x+3}{4x^2+6x+1}$

$0.1+6+3+0.4$

$\lim_{x\to1}\left(x-1\right)^{\sin\left(\pi x\right)}$

$\int\left(1-\cos\left(\frac{x}{2}\right)\right)^2\cdot\sin\left(\frac{x}{2}\right)dx$