$5\cdot4+5\cdot7$

$\frac{\left(x-1\right)^2-1}{\sqrt[20]{x-1}}$

$\frac{x^2-14x+50}{x^2-8}$

$\int\left(sin\left(3x\right)\sqrt{cos\left(3x\right)}\right)dx$

$\left(\frac{3}{4}x-\frac{2}{3}y\right)\left(\frac{3}{4}x+\frac{2}{3}y\right)$

$\lim_{x\to2}-x^2+3a$

$\int\frac{5x^2+7}{x^{\frac{3}{4}}}dx$