$h^2-30h+225$

$6x+3=5x-1$

$\frac{\left(-14x^5+72x^4+10x^3-108x^2-104x-33\right)}{\left(7x^2-8x-9\right)}$

$\left(5x^2\:-7y^2\right)^2$

$csc^{\left(4\right)}x-cot^{\left(4\right)}x=csc^{\left(2\right)}x+cot^{\left(2\right)}x$

$\lim_{n\to\infty}\left(\frac{6-n^3}{n^3-5n^2+2}\right)$

$\sin\left(\sin\left(3\right)+\sin\left(5\right)\right)=\cos\left(\cos\left(3\right)-\tan\left(5\right)\right)$