$\frac{1}{seca-1}+\frac{1}{seca+1}=2cosec$
$12z+9x-7+\left(-5z\right)-4x$
$\left(5+a\right)\left(5-b\right)$
$w=x^2+y^2+z^2,\:\:\frac{dw}{dt}$
$x^2+2=6x$
$\lim_{x\to0}\left(\left(6\sin x-1\right)\right)$
$\int x^n\log xdx$
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