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See the sin(x) dx? Well you have du = - sin(x) dx and u = cos(x)You get -du/u, which you can certainly integrate.

I think I can do it now.I will try the next time I wake up

Because you are already done! Look at the numerator and what du equals.

Are you familiar with integration by substitution?

But why are you doing this? I wanted an interation of it

du = - sin(x) dx

I am lost.What technique should I use?

That is the first step. Set u = cos(x)

zetafunc. wrote:Write tan(x) = sin(x)/cos(x).

Write tan(x) = sin(x)/cos(x).

Then?Please continue

I use a package or a table.

Ha ha ha! So, thats called the chain rule!Achchha, how do I integrate tan(x) by hand?

I mean about the chain rule. You did it!

Math is Fun. I am not sure if it is funny

That was funny, right?