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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.

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# Integrate sqrt ( 4 -x^2)dx

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