$\csc\left(y\right)dx+\sec\left(x\right)dy=0$
$\left(5b-2\right)^2+4=25b^2-20b$
$t^3-2t$
$\frac{1}{2}\left(x+5\right)=7.5$
$\frac{3x^5-20x^3}{32}$
$\left(+1\right)-\left(-2\right)-\left(+8\right)-\left(-5\right)$
$1-cos^2x=3cos^2x$
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