$\frac{x}{x-3}+\frac{3}{x+1}=-1$
$\lim_{x\to1}\left(\frac{\left(x\right)}{x^2-x}\right)$
$\int\frac{1}{x\left(0.4x+2\right)}dx$
$25a^2+4+20a$
$-8\cdot7\left(3-7\right)$
$\lim_{x\to0}\sqrt{-3x^3-7x+8}$
$\sin^2\left(x\right)+\cos\left(-\frac{13}{15}\right)=1$
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