d/dx
posted by Jen .
d/dx( ln sin(pi/x) ) = ?
Thanks.
If those are absolute value signs, the derivative will not exist when sin (pi/x) = 0, because of the sign change that occurs there. Assume sin (pi/x) > 0
Let u(x) = pi/x and v(x) = sin x, and use the chain rule.
d/dx ln v(u(x))=
d/dv dv/du du/dx
= [1/(sin (pi/x])*cos x*(pi/x^2)
That assumes sin (pi/x) is positive. Change the sign if it is negative
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