$\left(45.-12\right)\left(-38.4\right)$
$a+bx^{a+b}+ax^{a+b}+bx^{a+b}+4x^4$
$\frac{8x^4+4x^3+6x^2}{2x^2+1}$
$\int x^5\left(x^6+9\right)^7dx$
$\frac{1}{1-\:sinx}-\frac{sinx}{1+sin\:x}$
$\int x^3\cos\:x^4\:dx$
$x^2-5x\:<6$
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