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Mathematics
Mathematics
Problem
Justify, in one or two sentences, that
d
d
x
(
sin
x
cos
x
)
=
sec
2
x
\dfrac{d}{dx}\left(\dfrac{\sin x}{\cos x}\right)=\sec^{2}x
d
x
d
(
cos
x
sin
x
)
=
sec
2
x
.
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