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secondary 4 | A Maths
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Germaine
Germaine

secondary 4 chevron_right A Maths chevron_right Singapore

Please help me with this question.

Date Posted: 4 years ago
Views: 511

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Eric Nicholas K
Eric Nicholas K's answer
5997 answers (Tutor Details)
1st
This question is A Level stuff. You are not taught to integrate tan on its own. But tan square can be integrated if we concede into sec square minus 1.
J
J
4 years ago
This question is actually doable by O level students.

Just convert tan 3x into sin 3x / cos 3x using the trigo identity tanx = sinx/cosx .

Then it's directly integrable to -⅓ln(cos3x)
Eric Nicholas K
Eric Nicholas K
4 years ago
Eh ya I didn’t think of that.

You mean -1/3 ln (cos 3x).
J
J
4 years ago
Yes, edited alr