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

$\int_0^4\left(\frac{4}{4-x^2}\right)dx$

$10k-4k$

$\left(2x-1\right)dx=-\left(3y+7\right)dy$

$\int\frac{\left(x^4\right)}{x-1}dx$

$\left(\frac{\cos\left(b\right)\sec\left(b\right)}{\cot\left(b\right)}\right)\left(1-\sin^2\left(b\right)\right)$

$\left(x-1\right)\left(x+4\right)\le24$