o6analefostarf
o6analefostarf
05-08-2016
Mathematics
contestada
Prove 2SinAsinB =cos(A-B)-cos(A+B)
Respuesta :
HomertheGenius
HomertheGenius
05-08-2016
Right side of the equation:
cos ( A - B ) - cos ( A + B ) =
= cos A cos B + sin A sin B - ( cos A cos B - sin A sin B ) =
= cos A cos B + sin A sin B - cos A cos B + sin A sin B =
= 2 sin A sin B - left side of the equation
( correct )
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