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OpenStudy (anonymous):
express as a sum or difference sin7xsin4x
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OpenStudy (anonymous):
sin(a)sin(b)= 1/2[cos(a-b)-cos(a+b)]
OpenStudy (anonymous):
i know you use the sum - product formula but how do i go from there
OpenStudy (anonymous):
from two formula
OpenStudy (anonymous):
what do u want?
OpenStudy (anonymous):
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