$\left(9\right)\left(1+4\right)$
$\left(2a+3b-c-4d\right)^2$
$\sin^2\left(a\right)$
$y=3^{\ln\left(7x\right)}$
$\:-14\:-\:\left(-31\right)$
$\left(2a+b+c^2\right):3a^2$
$6a-a$
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