The equation of one of the tangents to the curve \[y=\cos (x+y),-2\pi \le x\le 2\pi \] that is parallel to the line \[x+2y=0,\] is

The equation of one of the tangents to the curve \[y=\cos (x+y),-2\pi

1.	The equation of one of the tangents to the curve \[y=\cos (x+y),-2\pi \le x\le 2\pi \] that is parallel to the line \[x+2y=0,\] is
A.	\[x+2y=1\]
B.	\[x+2y=\pi /2\]
C.	\[x+2y=\pi /4\]
D.	None of these
Answer» C. \[x+2y=\pi /4\]

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The equation of one of the tangents to the curve \[y=\cos (x+y),-2\pi \le x\le 2\pi \] that is parallel to the line \[x+2y=0,\] is

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