$\frac{1}{\sin\left(a\right)}+\left(1\right)$
$8-9+8\cdot5$
$3+a+b+a+a$
$8^{-3^2}$
$\sin\:x\cos\:x=-\cos x$
$b-5>-4$
$xsen\left(y\right)dy=x^2cos\left(y\right)dx\:$
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