This too shall pass
- Nov 6, 2011
Yes I did for 4UThanks Dude.
If I may ask, did you state rank for any of the mathematics courses?
I meant triangle PAB, not sure why I wrote DPC!I don't get how you used the cosine rule to get the value of sin alpha. Did you a certain value for PC?
Yes my bad that is supposed to be angle DAPI'm just a little confused, by using the sine rule with alpha as angle ADP shouldn't we get sin(theta) = xsin(alpha)/2? unless that's meant to be angle DAP?
Don't forget to divide by half!Let:
Using partial fractions we get:
Now for , we will let
Now this is just but for the next term. Hence what we have is a telescoping sum:
And we are left with just: