$\frac{tan^2x}{2\sin^2\left(x\right)}=\frac{1}{1+\cos\left(2x\right)}$
$\frac{2}{5}x+\frac{3}{2}y=2$
$\lim_{h\to0}\left(\frac{2-2cos\left(h\right)-sin^2\left(h\right)}{h}\right)$
$2\sqrt{16a^{10}}\cdot2\sqrt{3a^4}$
$\left|567\right|$
$\int\left(\frac{x}{y}\right)dx$
$99.\left(-3\right).\left(-5\right)$
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