$\left(2x+3y\right)\left(5x-4y\right)$

$\int\left(7-5x\right)^8dx$

$\lim_{x\to\infty}\left(x^3sin\frac{2}{x^3}\right)$

$3y^4-2x^3y+4x^3-5y^4x+3;x=1;y=3$

$-9\cdot14$

$1-\left(\frac{\frac{1}{3}\left(5\right)}{3}\right)\left(\frac{11}{4}\right)+0.7$

$3\cos^2\left(x\right)-\cos\left(x\right)=0$