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Show that (d)/(dx) e^(ax) cos (bx + c) =...

Show that `(d)/(dx) e^(ax) cos (bx + c) = r e^(ax) cos (bx + c + alpha)` where `r= sqrt(a^(2) + b^(2)), cosalpha= (a)/(r ), sin alpha = (b)/(r ) and (d^(2))/(dx^(2)) e^(ax) cos (ax + c) = r^(2) e^(ax ) cos (bx + c + 2 alpha)`.

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