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I have y=5sin(4x-pie/2). I need too find phase shift. I know c/b is shift. This is pie2/4=.392, but does not equal my answer and I don't know direction it should go. Can anyone help?

What do you mean by c/b? What do you mean by pie2/4=.392? What phase shift are you trying to achieve?

My book says c/b = the phase shift, as in y=a sin(bx - c). The question just says find the phase shift of the function.

OK, then PI/8 is the phase shift. c/b

3.14/8=.392 that is in radians. In degrees, it is 70.6 deg.

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