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yes well I got the last problem.....but I still wanna have an idea were the identity siny+sinx=2sin(x+y)/2cos(x+y)/2 came from please someone sort of explain plz! thanx
what you wrote is not an identity consider x=y=pi/2Dainy said:yes well I got the last problem.....but I still wanna have an idea were the identity siny+sinx=2sin(x+y)/2cos(x+y)/2 came from please someone sort of explain plz! thanx