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use a compound forumla angle forumla to determine a trignometric expression that is equivalent to each of the following expression:
a) sin(x-4pi/3)
a)cos(x-5pi/4)
b)sin(x+5pi/6)
c)cos(x+4pi/3)
a) sin(x-4pi/3)
a)cos(x-5pi/4)
b)sin(x+5pi/6)
c)cos(x+4pi/3)