# A-Math Integration of tan^2 x

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

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### One Response to A-Math Integration of tan^2 x

1. LinwooD says:

yes, it's feasible. we dont learn how to integrate tan so we have to change it to sec^2x - 1. great attempt :)