$\frac{dy}{dx}+\frac{5y}{x}=7x$

$-9a^2-12ab-b^2$

$\int_0^{\frac{\pi}{4}}\left(2sec^4\left(x\right)tan^4\left(x\right)\right)dx$

$-1-1-4$

$2\left(1.5a+4\right)-6a=-7$

$\left(0.3x^2y^2-\frac{1}{3}z\right)^2$

$\lim_{x\to0}\left(\cos\left(2x\right)\right)^{\frac{1}{sen\left(x^2\right)}}$