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Mathematics
Mathematics
Problem
For
f
(
x
)
=
cos
(
3
x
−
π
4
)
f(x)=\cos\bigl(3x-\tfrac{\pi}{4}\bigr)
f
(
x
)
=
cos
(
3
x
−
4
π
)
, calculate
f
′
(
π
/
4
)
f'(\pi/4)
f
′
(
π
/4
)
. a)
3
3
3
b)
−
3
-3
−
3
c)
0
0
0
d)
−
1
-1
−
1
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