$15\:cos\:\left(x\right)-5=4\:cos\left(x\right)$
$cosx\left(1+tanx\right)$
$\left(2xy+3\right)\cdot\left(2xy-3\right)$
$\left(\sin\left(a\right)+\cos\left(a\right)\right)^2=1+\sin\left(a\right)\cdot\cos\left(a\right)$
$3x^2+7x-3>0$
$3x\:-\:14\:+\:4x$
$7\:-\:14\:-\:\left(-7\right)$
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