$920\cdot0\cdot11$
$\left(3a^{3}-4b^{2}\right)\left(3a^{3}+4b^{2}\right)$
$\sqrt{x+3=3x}$
$y=\frac{2x+3}{x^2-8x+12}$
$\frac{1-cos2x}{csc^2x}=2sin^4x$
$9x^2-120-400$
$y=\frac{1}{3}\sec\left(\frac{\pi x}{2}+\frac{\pi}{2}\right)$
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