$\left(\sec\left(a\right)+\tan\left(a\right)\right).\left(1-\sin\left(a\right)\right)=\cos\left(a\right)$
$\left(9j-4k\right)\left(3j-2k\right)$
$-5+b-5+b-8$
$-3+\left(-4\right)\left(5\right)-\left(-7\right)\left(2\right)$
$3\left(4x-2\right)=30$
$z\:+\:z^{\:-\:1}\:=5$
$\frac{sec^23x-1}{sec^23x}=sin^23x$
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