# The integral which is irritating me

integral of tan(ax)*tan(bx)..............can we solve this general case.....i solved for some special cases like for angles 2x & 4x...............

Note by Pranav Patil
2 years, 11 months ago

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Not possible to have an elementary close form. Think of $$\tan(A+B) = \frac{\tan A + \tan B}{1 - \tan A \tan B}$$.

- 2 years, 11 months ago

i tried it..........rearranging......but no use......i also manipulated it differentely to use integration by parts...........also converted it to sin&cos......and used defactorization formulas....but its going too complicated.......and integral calculators are also not ansring.......

- 2 years, 11 months ago

That's why I said there's no closed form. You need to use elliptic integrals to solve it.

- 2 years, 11 months ago

i dont know about that............can you just give an idea or link.....

- 2 years, 11 months ago

This.

- 2 years, 11 months ago