Here's the question you clicked on:
ggrree
integral of: tan^78 (x) * sec^4 (x)
Is... that tan(x)^78? Good... Gods...
I'm not doing 78 half angle identity integrals.
Apparently there's a clever way to do it
You should make your teacher mad and do 70 half angle identity integrals.
Holy crap! thats a lot Tangents, anways: \[\sec^4x = \sec^2x \sec^2x = (\tan^2x +1)(\sec^2x)\] now use a U-Sub where: \[u=tanx\] \[du=\sec^2x dx\] so now we have: u^78 (u^2 + 1) du distributing the u^78, we get: u^80 - u^78 du now just integrate and we get (1/81) (u^81) + (1/79) (u^79) now plug back in the tanx (1/81) (tan^81x) + (1/79)(tan^79x)
i might have made a mistake somwhere, i mean, THATS A LOT O TANGENTS haha
Whoa man, that's like, clever. I was thinking also of something clever, like a series representation of each new half angle integral, but your method was by far the best.
Haha I just learned how to integrate the trig stuff so its still fresh in my mind. But I think it would be pretty smart to use a Series representation for each of the half-angles
That's the right answer. Thanks!