$\lim_{x\to\pi2}\sin\left(x\right)$
$\left(1-cos\left(\theta\right)\right)^{\frac{1}{2}}\times\left(1+cos\left(\theta\right)\right)^{\frac{1}{2}}\:=\:sin\left(\theta\right)$
$-7\left(b+12\right)=-7$
$6x\ge12+9x$
$12c^2+5c-11c^5$
$\frac{4x-3}{3}=\frac{x+8}{2}$
$x^3-x^2-x+x$
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