$\frac{36\sin48^{\circ}}{\sin70^{\circ}}$

$m^4-2m^3n+3m^2n^2-4n^4\cdot5mn^2+3m^2n-m^3$

$3x^2-300$

$13.6168-4.46\cdot2.58$

$m-1\sqrt{\frac{ab}{\sqrt[m]{ab}}}$

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

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