- #1

- 3

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I can't for the life of me remember what techniques I'm suppose to use to integrate:

(((x^2) + 1)^(1/2))dx and (cos(x)^4)dx

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- Thread starter WhataRecch
- Start date

- #1

- 3

- 0

I can't for the life of me remember what techniques I'm suppose to use to integrate:

(((x^2) + 1)^(1/2))dx and (cos(x)^4)dx

- #2

lanedance

Homework Helper

- 3,304

- 2

1) I'd try a trig sub, 2) Use some trig identities to simply it to lower orders of cosx

- #3

hunt_mat

Homework Helper

- 1,760

- 27

For the first use x=tan u for the second use cos^{2}x=(1+cos2x)/2 three times

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