Eric Nicholas K's answer to Kathy's Secondary 4 A Maths Singapore question.
done
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(i) and (ii), simplified
Date Posted:
4 years ago
I will not do part (iii) here. One look and we can tell that squaring dy/dx will not get you d2y/dx2.
In this case the numerator happens to be simplifiable. In most cases, however, we do not need to expand and simplify the terms (recall that I did not simplify until very detailed in the regular quotient rule questions last week).
I like to do long division here, as I am more or less confident that the expression becomes more easily differentiable.
Ok . Thank you
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