$\int-4\cdot\cos\left(-6x\right)dx$

$x^2-\frac{14}{4}x$

$\frac{12x^8y^5}{8x^3y^4}$

$74^2$

$\frac{dy}{dx}=\frac{1}{3}x^3+\frac{1}{2}x^2-3x+5$

$\frac{7}{6}a^2-\frac{3}{2}b^4-\frac{4}{6}b^4-\frac{5}{2}a^2-\frac{10}{6}a^2+\frac{7}{6}b^4$

$x\frac{dy}{dx}+y=x\cos\left(x\right)$