Example 4 if cos^-1(x)+cos^-1(y)+cos^-1(z)=π show that x^2+y^2+z^2+2xyz=1
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If cos^–1x + cos^–1y + cos^–1z = π prove that x^2 + y^2 + z^2 + 2xyz = 1
Prove that
cos-1 x+ cos-1y=cos-1[xy-√(1-x^2)√(1-y^2)] ___
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