-1: & -\pi \leq x \leq 0 \\
1: & 0 \end{array}\right. defined on the interval [-, T]. (b) State the Intermediate Value Theorem and use it to show that f(x)=2 x^{4}-7 x^{2}+x+2 has four real solutions. (c) Let f(x)=\left\{\begin{aligned} x &: x \leq 0 \\ -x &: x>0 \end{aligned}\right. Show that f(x) is not differentiable at x = 0. Explain your answer carefully.
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