Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Mathematics
Mathematics
Problem
For
f
(
x
)
=
x
sin
x
f(x)=x\sin x
f
(
x
)
=
x
sin
x
, which of the following expressions equals
f
′
(
x
)
f'(x)
f
′
(
x
)
? a)
x
cos
x
x\cos x
x
cos
x
b)
sin
x
+
x
cos
x
\sin x + x\cos x
sin
x
+
x
cos
x
c)
sin
x
cos
x
\sin x\cos x
sin
x
cos
x
d)
x
(
sin
x
+
cos
x
)
x\,(\sin x+\cos x)
x
(
sin
x
+
cos
x
)
Browse the problem library