Integrate sqrt ( 4 -x^2)dx

Hi,

Can anyone help me integrate :

Integral sqrt ( 4 - x^2) dx

Some ideas:

Make a subsitution x2 = cos (theta)

Taking the derivative of both sides:

2x = - sin (theta).d(theta)

or....

Double angle identity:

(Cosx)^2 = 1 + cos2x / 2

Can anybody give some ideas.

reading math is difficult

Hi

May be a bit out of context of the problem of discussion...but I felt a lot of inconvenience in going through the solution...as I could not read math as text...

is there no other way of posting math symbols?

thanx

vms