$\left(-7\right).\left[\left(+4\right)\:.\left(-5\right)\right]$
$\frac{\left(sin\:2x\right)}{\:sin\:\left(\left(\frac{\pi\:}{2}\right)-\:x\right)}\:=\:2sin\left(x\right)$
$-9x^2-4x-51$
$\frac{e^{\ln\left(x\right)}}{x^2+7}$
$-32\cdot43$
$\int-6x^2dx$
$-\left(1.5\right)^4$
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