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Mathematics
Mathematics
Problem
If
f
(
x
)
=
∣
cos
x
−
sin
x
∣
f(x) = |\cos x - \sin x|
f
(
x
)
=
∣
cos
x
−
sin
x
∣
, then
f
′
(
π
4
)
f'\left(\frac{\pi}{4}\right)
f
′
(
4
π
)
is equal to a.
2
\sqrt{2}
2
b.
−
2
-\sqrt{2}
−
2
c. 0 d. None of these
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