$5cosx+6=10cosx+5$
$-7^2.-7^5.-7^{-4}$
$\left(2x^4y^4\right)^4$
$\left(y+1\right)^3\left(y-1\right)$
$\left(e^y\right)\left(ye^x\right)$
$0.19635\cdot4$
$\cot\left(-x\right)=-\cot\left(x\right)$
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