$\tan\left(42^{\circ}\right)\cot\left(42^{\circ}\right)$
$4a^4=2a^3$
$\int9x\ln\left(x^5\right)dx$
$64m^2-9$
$2ab-9+8ab-3+ab+1a$
$100x^2-40x$
$\left(a+3b\right)+5c\left(a+3b\right)+5c$
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