SOLUTION: prove this equation to be an identity;
(sin(3x/7))(cos(4x/7)) + (cos(3x/7))(sin(4x/7)) = sin(x)
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Question 756970: prove this equation to be an identity;
(sin(3x/7))(cos(4x/7)) + (cos(3x/7))(sin(4x/7)) = sin(x)
Answer by tommyt3rd(5050) (Show Source): You can put this solution on YOUR website!
Angle sum formula:
the two angles are 3x/7 and 4x/7
therefore their sum is x
:)
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