$f(x) = \sin x + \cos x=>f(x)=> f \bigg(\large\frac{\pi}{4}\bigg)$$f^{(iv)} \bigg (\large\frac{\pi}{4}\bigg)=$

Question

$$\begin {array} {1 1} (1)\;1 & \quad (2)\;2 \\ (3)\;3 & \quad (4)\;4 \end {array}$$