prove that sin 8A+ sin 2a = 2 sin 5a cos 3a
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use the formula. ...
Sin(A) + sin (B) = 2 sin a+b÷2 cos A-B÷2
we get .....
2sin5A cos 3a
hope that's very simple to understand. ...
hope it's helpfull...
Sin(A) + sin (B) = 2 sin a+b÷2 cos A-B÷2
we get .....
2sin5A cos 3a
hope that's very simple to understand. ...
hope it's helpfull...
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