- How to find differential of dy? y=-x^2 - 4 . Show steps if you can?

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2 sounds of 3000Hz & 6000Hz frequencies emerge from .50m diameter circular opening of speaker. Find diffraction angle for sound of each freq? 30 multiplied by 6475? How was the cov( X(s), X(t)) obtained. i know that E[x(s)] * E[x(t)] = 0 but i don't know how to calculate E[x(s) x(t)]? How can i shere my picture or video? Find the point on the parabola x+y^2=0that is closest to the point (0,-3)?