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Mathematics
Mathematics
Problem
Explain, in one sentence, why the expression
1
−
cos
2
x
sin
x
\dfrac{1-\cos^{2}x}{\sin x}
sin
x
1
−
cos
2
x
simplifies to
sin
x
\sin x
sin
x
for all real
x
x
x
for which
sin
x
≠
0
\sin x \neq 0
sin
x
=
0
.
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