If an equation of a tangent to the curve, \[y=\cos (x+y),\] \[-1 \le x\le 1 + \pi \], is \[x+2y=k\] then k is equal to:

If an equation of a tangent to the curve, \[y=\cos (x+y),\] \[-1 \le

1.	If an equation of a tangent to the curve, \[y=\cos (x+y),\] \[-1 \le x\le 1 + \pi \], is \[x+2y=k\] then k is equal to:
A.	1
B.	2
C.	\[\frac{\pi }{4}\]
D.	\[\frac{\pi }{2}\]
Answer» E.

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If an equation of a tangent to the curve, \[y=\cos (x+y),\] \[-1 \le x\le 1 + \pi \], is \[x+2y=k\] then k is equal to:

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