1.
Let f(x)={ln(cosx)ax,x>00,x=0ex1bx,x<0f(x)=\begin{cases} \frac{\ln(\cos x)}{a x}, & x>0 \\ 0, & x=0 \\ \frac{e^x-1}{b x}, & x<0 \end{cases}. If f(0)=π4f'(0)=\frac{\pi}{4}, then