Find an Equation of the Tangent Line to the Given $y = \frac { \sin x } { x + 1 } \text { at } ( 0,0 )$

Essay

Find an equation of the tangent line to the given curve at the given point.(a) $y = \frac { \sin x } { x + 1 } \text { at } ( 0,0 )$ (b) $y = \frac { \cos x } { x + 1 } \text { at } \left( 0 , \frac { 1 } { 2 } \right)$