$\lim_{x\to\left(0\right)}\left(\frac{ln\left(cos\left(2x\right)\right)}{ln\left(cos\left(3x\right)\right)}\right)$

$b^2-30b=8$

$\left(9y+1\right)^2$

$\int\left(5x^{4}+3x^{2}+5\right)\cos\left(x^{5}+x^{3}+5x\right)dx$

$343+147x+21x^2+x^3$

$n=\sqrt[3]{a^2}.\sqrt[4]{a^3}.\sqrt{a^5}$

$\frac{-2y-2x+2y}{x^2-2xy}$