$2^3+2^2-2^4$
$2b^2+8+5b+1$
$\int\left(x+1\right)\cdot\left(x^2+2x+5\right)^{\frac{1}{2}}$
$8x+2-7x+4$
$9x^4+24x^2+16$
$2\cdot sen\:\left(x-1\right)=0$
$\cos\left(2x\right)+\cos\left(4x\right)=0$
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