# Three in One: Boom

Calculus Level 5

Let $$f(x)$$ be a function continuous for all $$x\in \mathbb R$$ except at $$x=0$$ such that:

• $$f'(x) < 0, \forall x \in(-\infty,0)$$
• $$f'(x) > 0, \forall x \in(0,\infty)$$
• $$\lim_{x \to 0^{+}} f(x) = 2$$
• $$\lim_{x \to 0^{-}} f(x) = 3$$
• $$f(0) = 4$$

And that:

$\begin{cases} \displaystyle 2\lim_{x \to 0}f(x^3 - x^2) =\displaystyle \mu \lim_{x \to 0}f(2x^4 - x^5) \\ \displaystyle \lim_{x \to 0^{+}} \dfrac{f (-x) x^2} {\left \{\frac{1-\cos x}{\lfloor f(x) \rfloor} \right \}} = \lambda \\ \displaystyle \lim_{x \to 0^{-}} \left (\left \lfloor 3f \left(\frac{x^3 - \sin^{3}(x)}{x^4}\right) \right \rfloor - f \left(\left \lfloor \frac{\sin(x^3)}{x} \right \rfloor \right) \right) = \varphi \end{cases}$

Find $$\mu \cdot \lambda \cdot \varphi$$

Notations:

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