$1-\tan^2\left(a\right)=2-\sec^2\left(a\right)$
$25x^2+10xy+y^2$
$\left(\frac{1}{2}x^{-\frac{1}{2}}\right)^2$
$-15-\left(-7+4\right)+\left(-8\right)$
$\int\sqrt{25-f^2}df$
$\left(7+2a^2\right)\left(-5+2a^2\right)$
$x+2<x-1$
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