Question: Use the commands from Section 11.2 to show that: (a) sin(4x) = 4sinxcosx - 8sin3xcosx (b) cosxcosy = 1/2[cos(x - y) + cos(x + y)]

Use the commands from Section 11.2 to show that:
(a) sin(4x) = 4sinxcosx - 8sin3xcosx
(b) cosxcosy = 1/2[cos(x - y) + cos(x + y)]

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