Why does the derivative of sin pi/4 = 0?

I'm trying to find the derivative of y=sin pi/4, and i would assume that it should be y1=cos pi/4, but it's not, it is 0.
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2 Answers

because sinpi/4 is not variable it is a constant thus its derivative is 0
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because sin pi/4 is not variable it is a constant thus its derivative is 0
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