$2\sin^{2}77^{\circ}$

$\left(\frac{81}{9}\right)+\left(\frac{64}{16}\right)$

$2\sin^2\left(x\right)=5\sin\left(x\right)-3$

$\sqrt{x}\left(3x-2\right)^5$

$\lim_{x\to0}\left(\frac{\left(1-x\right)^3-1}{x}\right)$

$4t^{-\frac{3}{8}}$

$2|3-5\cdot\left(4-7\right)+6\cdot\left(2|-5\right)$