$\frac{6\left(\sin^2x+2\cos^2x\right)}{\cos x\sin x}=\frac{5\sqrt{3}}{\cos x}$

$\frac{dy}{dx}=7xz$

$-2x^4y^4\cdot\left(x^4\right)^4$

$\left(x^2-3\right)\cdot\left(x^2-2x+4\right)$

$25x^2-30x+81$

$\left(-32\right)\:+\:45\:x\:64\:x\:\left(_{-31}\right)$

$\frac{\sec x}{1}+\frac{\csc x}{\cot x}=\sec x$