Solve the Problem $y = \cos x$ At $x = \frac { \pi } { 2 }$

Multiple Choice

Solve the problem.
-Find the tangent to $y = \cos x$ at $x = \frac { \pi } { 2 }$ .

A) $y = - x + \frac { \pi } { 2 }$
B) $y = - x - \frac { \pi } { 2 }$
C) $\mathrm { y } = 1$
D) $y = x + \frac { \pi } { 2 }$