$56\:-\:\left(-21\right)$
$21x+35x^4-14$
$+32-\left(-7\right)+\left(-32\right)-\left(-32\right)+\left(+42\right)$
$\left(x^8+2\right)-1$
$-3e^xtan\left(y\right)dx=\left(2-e^x\right)sec^2\left(y\right)dy$
$9cos^2x-9sin^2x=18cos^2x-9$
$15a^3-6a^4+12a$
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