$cos\:\left(\pi\:\:\:-\:x\right)+\:sin\:\left(\frac{\pi\:\:\:\:}{2}+\:x\:\right)=\:0$
$cos\left(x\right)=-.35$
$12.1\cdot1.2$
$y'+y=-2$
$\:x^2\:+\:8x\:+\:16$
$a^2-a+20$
$2\sqrt{3x^2y}$
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