$7^2-6^2+4^2$

$\int\frac{6x-11}{\left(x-1\right)^2}dx$

$\lim_{x\to0}\left(\frac{2senx\cdot\left(senx+b\right)}{x}\right)$

$12+-17+6+-13-1$

$1+\cot\left(x\right)=\frac{\sin\left(x\right)+\cos\left(x\right)}{\sin\left(x\right)}$

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

$y=-4\cot\left(x^2-2x\right)$