Question: Together with the identities sin (h + c) = sin h cos c + cos h sin c, cos (h + c) = cos h

Together with the identities sin (h + c) = sin h cos c + cos h sin c, cos (h + c) = cos h cos c - sin h sin c to prove that both ƒ(x) = sin x and g(x) = cos x are continuous at every point x = c.

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