$\frac{1-2\:\sin^2\left(a\right)}{\cos\left(a\right)-\sin\left(a\right)}$
$\lim_{x\to0}a^x+b^x$
$\sqrt[6]{\left(2x\right)^2}$
$\frac{dy}{dx}=\frac{x^2-1}{-y}$
$9x^2+6x+10=0$
$\left(3x^n-7y^n\right)^2$
$12-3+5-38+23-25+3-10+30$
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