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Find the value of ∫∫∫zdxdydz where V is the hemisphere x^2 + y^2 + z^2 = a^2, z ≥ 0.

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Find the value of ∫∫∫zdxdydz where V is the hemisphere x2 + y2 + z2 = a2,  z ≥ 0.

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Put x = a sin θ

dx = a cos θ dθ

θ varies from 0 to π/2

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