$2\sin\left(a\right)^2-\sin\left(a\right)=1$

$-2x^4+5x^3\:+10x^2\:-25x$

$\csc\infty=\sin\infty+\cos\infty\cot\infty$

$\left(y^1+1\right)\left(y^3+7\right)$

$\frac{1}{\left(x^2-1\right)}+\frac{1}{\left(x+1\right)}$

$\lim_{x\to\infty}\left(\frac{3x^2+4x+1}{x^2-x-2}\right)$

$6\sqrt{3}-6i$