Jiayang's answer to Hanifah's Junior College 1 H1 Maths question.
Can u explain it??
It's just the definition of the derivative.
Typically you'd have f(a+x) - f(a) as your numerator then you'd get f'(a). But in this case it's the negative.
Typically you'd have f(a+x) - f(a) as your numerator then you'd get f'(a). But in this case it's the negative.
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