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# C4 question Watch

1. (Original post by Voyageuse)
So you can do part a). For b), use the bit you've worked out as the integral. But you need to change the limits, as the limits give in the question are for an integral in terms of x. To change the limits, put each limit into the substitution equation...
a) u=e^x +1, u=e^1 +1 and u=e^0 +1, so the new limits are u=e+1 and u=1
b) x=sin^2(theta), 1=sin^2(theta) and 0=sin^2(theta), sin(theta)=1 and sin(theta)=0, so the new limits are 90 and 0.
Put the new limits into your equation from part one and then integrate as usual
You need to work in radians
Are you doing A levels now?
yes I am
lol the top question.
Lol, they're both 6ii)
And again, because its a definite integral, if you use a substitution and if you change the limits you get the same value, you don't need to replace the x's in.
3. (Original post by joostan)
yes I am

Lol, they're both 6ii)
And again, because its a definite integral, if you use a substitution and if you change the limits you get the same value, you don't need to replace the x's in.
See that is the thing, I barely remember my first year maths degree, so this stuff is pretty foreign to me unless I read over it.

Like If I did C4 now, I would probably fail miserably. I vaguely remember vectors being a pain in the arse in C4, and the messed up "let's integrate everything in the world" bit at the end.
See that is the thing, I barely remember my first year maths degree, so this stuff is pretty foreign to me unless I read over it.

Like If I did C4 now, I would probably fail miserably. I vaguely remember vectors being a pain in the arse in C4, and the messed up "let's integrate everything in the world" bit at the end.
Yeah, though the number of marks you get for vectors is literally disgusting, there's 14 marks on it in some papers
5. (Original post by joostan)
Yeah, though the number of marks you get for vectors is literally disgusting, there's 14 marks on it in some papers
Wow, lol.

I find in the A2 maths exams they get very creative with the questions, so creative in fact that you cant even revise some of their tricks, it's either you see it or you dont.

That's why I like university maths, its more straightforward, none of this trying to trick you business. The lecturer writes the notes, he writes the tutorials, he writes the coursework, he writes the exam and he marks it.
THAT'S HOW IT SHOULD BE
Wow, lol.

I find in the A2 maths exams they get very creative with the questions, so creative in fact that you cant even revise some of their tricks, it's either you see it or you dont.

That's why I like university maths, its more straightforward, none of this trying to trick you business. The lecturer writes the notes, he writes the tutorials, he writes the coursework, he writes the exam and he marks it.
THAT'S HOW IT SHOULD BE
Where do you study?
7. (Original post by joostan)
Where do you study?
It's a university in London.
I would tell you more, but I'd rather remain vaguely anonymous on here.

It is a pretty good university though.
It's a university in London.
I would tell you more, but I'd rather remain vaguely anonymous on here.

It is a pretty good university though.
fair enough, no worries

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