$cos\:x+2cos\:2x$
$3\cdot2236$
$\int x\ln\sqrt{x-1}dx$
$19\:+90$
$\frac{3^9}{\left(-3^{\:6}\right)}$
$a^2+b^2=9\:$
$\int\sqrt{7x+6\:}dx$
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