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y=sinx / 根号2 sin(x+π/4) -1/2
y' = [cosx sin(x+π/4) - sinx cos(x+π/4) ] / 根号2 sin^2 (x+π/4)
=sinπ/4 / 根号2 sin^2 (x+π/4)
y'| x=π/4 = 1/2
y' = [cosx sin(x+π/4) - sinx cos(x+π/4) ] / 根号2 sin^2 (x+π/4)
=sinπ/4 / 根号2 sin^2 (x+π/4)
y'| x=π/4 = 1/2
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