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If \(f(x) = x^2\), \(g(x) = 3x\) and \(h(x) = x - 2\). Prove that \((f \circ g) \circ h = f \circ (g \circ h)\).
 
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This is a self-assessment task. Solve this question and assess the solution steps after the completion of the test on your own.