$cos\:\left(\theta\:\:+\:\frac{\pi\:}{2}\right)=\:sin\:\theta\:$
$2a^2-3a-14$
$x^2\:+\:5x\:+\:4$
$-25\cdot7$
$v^2+6v$
$\left(z^2\right)^2$
$0=2ycosxdx+3senxdy$
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