$sec^2k=1+tan^2k$
$-21=-7x$
$a^4+6y+9^2$
$\frac{4}{x+1}.\frac{x+2}{2}$
$16x^2+26x+9$
$-4\:\:x\:\:-1$
$\left(-7-4i\right)+\left(7-5i\right)-\left(-3+2i\right)$
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