For what value of x \((0 \leqslant x \leqslant \frac{\pi }{2})\), the function y = \(\frac{x}{{1 + x tan x}}\) has maximum value at?
1
tanx
2
0
3
cotx
4
cosx
For what value of x \((0 \leqslant x \leqslant \frac{\pi }{2})\), the function y = \(\frac{x}{{1 + x tan x}}\) has maximum value at?