$\frac{1-4sec^2x}{1-2secx}=1+2secx$
$cosec^2x+cot^2$
$12+3.18-9$
$-8-w>-7$
$\left(x^{a+1}-3x^{a+2}\right)^2$
$3x+3=18$
$\int_{-\infty}^1\left(\frac{1}{x^2-3x+2}\right)dx$
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