$\left(a^2\right)\left(-2a^{x-1}\right)$
$\frac{\sin\left(2.a\right).\cos\left(a\right)-\sin\left(a\right).\cos\left(2.a\right)}{\sin\left(a\right).\cos\left(a\right)}$
$\left(x+3333\right)^53\cdot$
$\lim_{x\to0}\left(\frac{x^2-4x+4}{sin^2\left(\pi x\right)}\right)$
$\left(x^2-x^4\right).\left(2x-x^2\right)$
$\int9e^{-3x}dx$
$3.75+3.5+4.75$
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