If ac = r cos θ. sin Φ; y = r sinθ. sinΦ; z = r cos Φ. Prove that x² + y² + z²= r².

If ac = r cos θ. sin Φ; y = r sinθ. sinΦ; z = r cos Φ. Prove that

1.	If ac = r cos θ. sin Φ; y = r sinθ. sinΦ; z = r cos Φ. Prove that x² + y² + z²= r².
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