Another question from O Level Additional Mathematics (A-Math).
lijun(: said...
i came across this qu that day, and i really want to clarify if the method i used is correct or not.int(tan^2x - x^3)
i changed it to int(sec^2x - 1 - x^3) instead, cos i don't think we can integrate tan.
is that feasible?
Absolutely. Since tan^2 x can't be integrated, you must think of alternative by making use of the relationship of tan^2 x + 1 = sec^2 x
Ai Ling Ong
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yes, it's feasible. we dont learn how to integrate tan so we have to change it to sec^2x - 1. great attempt :)