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Mathematics
Mathematics
Problem
Explain why the statement
d
d
x
(
sin
x
x
)
=
cos
x
1
\displaystyle \frac{d}{dx}\left(\frac{\sin x}{x}\right)=\frac{\cos x}{1}
d
x
d
(
x
sin
x
)
=
1
cos
x
is incorrect.
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