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First find dy/dx:

dy/dx = 4x - 4

And thus at (3,15):

dy/dx = 12 - 4 = 8 = m (as m is the gradient of a curve)

So using y - y₁ = m(x - x₁) where...

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Most of the differentiation problems require us to apply one of the well known rules, be it product rule, quotient rule or chain rule. But those problems have one thing in common:  explicite formula for y...

Normally in Latin languages, a word will have a stress on its penultimate vowel. However, if you say the word to yourself and hear that the stress is not on the penultimate vowel but indeed on the last le...