$7a+3b-5a+2b$

$-7+3xy^2+5y-3y+2-4xy^2$

$\int2cos^4\left(x\right)sin\left(x\right)dx$

$\int x\left(8+x+5x^2+e^x\right)dx$

$\int\left(4x^3-5x\right)\left(12x^2-5\right)dx$

$f\left(x\right)=\frac{4x}{x^2-2x+1}$

$\int_{\frac{-2\pi}{3}}^{\frac{\pi}{4}}4\sin\left(x\right)dx$