$9a^2-x^2$
$\frac{\tan\:\left(a\right)}{\sec\:\left(a\right)}$
$6x>20$
$\left(2x^2+1\right)\left(1-2x\right)^2$
$x^2+y^2;\:x=4;\:y=8$
$\int x^2y^5dx$
$\cos\left(\frac{\pi}{4}+\frac{x}{2}\right)\sin\left(\frac{\pi}{4}-\frac{3\pi}{2}\right)$
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