Question

The maximum directional derivative of
cos
(
x
+
y
+
z
)
at
(
0
,
0
,
−
π
2
)
is​

Answer 1

Answer:

0

Step-by-step explanation:

$cos(x + y + z) \\ at \: (0 \: \: 0 \: \: - \frac{\pi}{2} ) \\ \\ = cos(0 + 0 + ( - \frac{\pi}{2} )) \\ = cos( - \frac{\pi}{2} ) \\ = 0$