$$\text { Approximate the zero of } f ( x ) = \cos ( x ) + 3 x \text { in } [ - 1,1 ] \text { to within } 0.00001 \text {. }$$

$$\text { Approximate the zero of } f ( x ) = \cos ( x ) + 3 x \text { in } [ - 1,1 ] \text { to within } 0.00001 \text {. }$$