harish21 Feb 2010 1,036 386 Dirty South May 24, 2010 #2 besito2001 said: I need help if any one has suggestions y=sin (3x+ pi/2) Click to expand... What exactly does your question ask?? All I can tell is: \(\displaystyle sin(A+B) = sinA.cosB + cosA.sinB\) so if you substitute \(\displaystyle A=3x\) and \(\displaystyle B= \frac{\pi}{2}\), you have \(\displaystyle y=cos(3x)\)

besito2001 said: I need help if any one has suggestions y=sin (3x+ pi/2) Click to expand... What exactly does your question ask?? All I can tell is: \(\displaystyle sin(A+B) = sinA.cosB + cosA.sinB\) so if you substitute \(\displaystyle A=3x\) and \(\displaystyle B= \frac{\pi}{2}\), you have \(\displaystyle y=cos(3x)\)