Aloysius's answer to xy's Secondary 4 A Maths Singapore question.
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Where f(x) is increasing, you need to prove that f'(x) > 0. This is because f'(x) is the gradient of the graph, so a positive gradient means that the f(x) graph is increasing.
Date Posted:
5 years ago
Then why does the graph on the right looks like this? Isn’t it suppose to be a smiling face? Or is it for E math?
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