Prove the relation: cos^-1 x0 =(sqrt(1-x...

Prove the relation: `cos^-1 x_0 =(sqrt(1-x_0^2)/(x_1x_2x_3…to oo))` where the succesive quantities `x_r` are connected by the relation `x_(r+1)= sqrt((1+x_r)/2)`

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