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secondary 4 | A Maths
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qaz
Qaz

secondary 4 chevron_right A Maths chevron_right Singapore

help to differentiate pls !

Date Posted: 3 months ago
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Eric Nicholas K
Eric Nicholas K's answer
2346 answers (Tutor Details)
1st
Let u = tan 5x such that you are differentiating 4u3 with respect to x.

Differentiating the above becomes
12u2 times du/dx

Now we obtain du/dx i.e. differentiate tan 5x with respect to x. We let w = 5x such that you are differentiating tan w with respect to x.

Differentiating tan w gives sec2 w times dw/dx.

dw/dx = 5.

Combine the results, and you get

12u2 times sec2 w times 5
= 12 tan2 5x sec2 5x times 5
= 60 tan2 5x sec2 5x