$f9=2x+3$
$25+\left(7-5\right)-\left(2-12\right)$
$\left(x^2-y^2\right)dx\:-2xy\cdot dy$
$x^2+18x+91$
$x^2x+19x+x$
$-2csc\left(t\right)^2+2$
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