Homework Statement
^Homework Equations
The Attempt at a Solution
y = tanx^cosx
lny = cosx(ln(tanx))
1/y(dy/dx) = (sec^2x * cosx)/tanx + ln(tanx)(-sinx)
at pi/4
1/y(dy/dx) = (1 * 1/sqrt(2))/1 + ln(1)(-sin(pi/4))
1/y(dy/dx) = 1/sqrt(2) + 0 ******* ln1 = 0
***
y = tanx^cosx => 1^(1/sqrt(2))...