A few days ago
Calc problem, prove this please?
prove sin4x/sinx = 4cosxcos2x
show all work please.
your help is greatly appreciated.
Top 1 Answers
A few days ago
Favorite Answer
sin(4x)
= sin(2 * (2x) )
= 2 sin(2x) cos(2x)
= 2 (2sin(x)cos(x)) cos(2x)
= 4sin(x)cos(x)cos(2x).
Dividing by sin(x):
sin(4x) / sin(x) = 4cos(x)cos(2x).
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