$3+2\cdot7$
$\int2x\:cos\left(7x\right)\:dx$
$\frac{\left(csc^2\left(x\right)-1\right)}{csc^2\left(x\right)-csc\left(x\right)}=1+sin\left(x\right)$
$\left(15x^{12}-100\right)\left(15x^{12}+80\right)$
$( x ^ { 4 } - 4 y - c ^ { 2 } ) ^ { 2 }$
$\left(-2x^3-4x^2+2x\right)-\left(3x^3-x^2+x-5\right)$
$x^2;x=-4$
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