$\left(5+b\right)^2$
$2\cdot5-4\cdot3+6\cdot2-7\cdot$
$\frac{\sec\left(x\right)+\tan\left(x\right)-\sec\left(x\right)-\tan\left(x\right)}{\sec\left(x\right)-\tan\left(x\right)\sec\left(x\right)+\tan\left(x\right)}$
$\frac{1}{\sqrt{x+y}}$
$3\left(2a\right)\left(3b\right)^2$
$2y^3-7x^2=5$
$\:-6x^2-\:x^2$
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