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Thanks for your help! :)

Something of the form (ax+b). Decided to assume that (u) is in that form and so worked it through. Is ln(2) the final answer?

I have but I thought it had to be a linear expression to use the natural log. It did cross my mind though - this is what to do, then?

Homework Statement Homework Equations None. Well, dx=du/cosx The Attempt at a Solution I've substituted it in, got new values for the limits but I have u^-1 on the bottom and so can't integrate it from my current knowledge. Basically I'm stuck with: Integration of u^(-1) du...

Thanks for the reply. I think I realized why I was lost - it's because I was! We haven't been taught this part of vectors yet, and I was looking at a past paper. Haha, oops. The picture was already printed for me and I thought that a=(-c). I better stick to diagrams of squares. :)

Homework Statement "PRQSTU is a regular hexagon of side 2 units. PQ,QR and RS represent vectors a, b andc respectively. Find the value of a.(b + c) The hexagon is a regular hexagon starting at the far left (ie pointing left) with P then anti clockwise through U at the top left...

Thank you! I just figured out what you were saying. I didn't see it as a quadratic equation at all - oh dear (exam in 4 day, haha). Figured it out, now just need to calculate the actual angles invovled. Thanks again. Mark

Hi. Thanks for the reply. I've never been taught how to do that, so is there another way of doing it? Thanks again, Mark

Homework Statement Solve the following trigonomic equation for 0<=x360<= : 5cos2x + cosx + 2 = 0 Homework Equations Not sure what goes here but I've been trying to substitute these - cos2x = cos^2x - sin^2x cos2x = 2cosx^2 - 1 - I think this is the correct one to use. cos2x = 1 -...