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. :)
"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...
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.
Solve the following trigonomic equation for 0<=x360<= :
5cos2x + cosx + 2 = 0
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 -...