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What does The Poynting vector equation indicates? In which quadrants is square root of 1-sin^2 x (this next part is out of the square root) =cosx an identity? In reality do we really understand what the substance of light is when its deemed to have no volume? Why do my sneezes smell like bees? Can someone please help me. The question reads, “Suppose that x>1. Prove that the limit as n goes to infinity of x^(1/n) = 1”?