$16x^2-64x^2+64$
$\left(9a^2+8\right)\left(-8+9a^2\right)$
$\int2x\cos5xdx$
$\frac{\left(\sin\left(3x\right)\right)}{\left(\cos\left(2x\right)\tan\left(2x\right)\right)}$
$5x+9-\left(6x-7\right)$
$f\left(x\right)=\sqrt{\frac{x^2-9}{x}}$
$-3t+4=19$
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