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# C4 Integration - Trapezium Rule watch

1. Please can I have some help. I've been stuck on this question for ages now, I just can't seem to get the answer! I've even looked at the help CD, but I can't see how they got their y values.

Use the trapezium rule with n strips to estimate the following:

[Integration sign] 1, -1 Cosec^2(X^2+1)dx ; n=4

I got crazy large numbers. The help CD gives the following values:

x = -1; cosec^2(X^2+1) = 1.209
x = -0.5 = 1.110
x = 0 = 1.412
x = 0.5 = 1.110
x = 1 = 1.209

I can't seem to get the values, so if someone could explain that, then I think I could do the rest.

2. Are you working in radians or degrees? And are you following the formula properly?
3. (Original post by Ben121)
Are you working in radians or degrees? And are you following the formula properly?
Oh, I feel so stupid now! I had it in degrees and it should have been radians. Thank you!
4. I had the same problem on this question.. do u always have to work in radians?
5. (Original post by Ben121)
Are you working in radians or degrees? And are you following the formula properly?
Why d'you have to work in radians on this question?
Why d'you have to work in radians on this question?
Why d'you have to work in radians on this question?
Any questions that involve integration or differentiation of trigonometric functions will always be in radians. If you don't use radians, pi appears all over the place and it can get very messy.
8. r u joking
9. (Original post by Milk <3)
r u joking
Is that directed to me? If so, no.

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