- #1
justwild
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Homework Statement
To prove that [itex]\sum[/itex] over m=1 to 15 of sin(4m-2) = 1/4sin2, where all angles are in degress
Homework Equations
The Attempt at a Solution
Tried to solve it using identity sinx+siny=2sin((x+y)/2)cos((x-y)/2)..but all attempts failed..help