$\sqrt{2}\sin\left(x\right)-2\sin\left(2x\right)=-\sin\left(2x\right)$

$x^5-44x^2$

$\lim_{x\to0}\left(\frac{2x+1}{-2x+1}\right)$

$15^3m^2n$

$a+6a+3$

$\frac{\sin\left(y\right)}{\tan\left(y\right)}+\frac{\cos\left(y\right)}{\cot\left(y\right)}=\sin\left(y\right)+\cos\left(y\right)$

$\left(3k-i^2\right)^2$