$\frac{a^2-49b^2}{a-7b}$
$3\cdot2^3-\left(-1\right)^4-2\cdot3$
$4-6\sin^2x=\cos x$
$\left(x^2+6x\right)-\:\left(x-3\right)\:$
$9x^8-100y^6$
$9^5-7^2$
$\:3z\sqrt{5x}+4\sqrt{20xz^2}-8z\sqrt{45x}$
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