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Mathematics
Mathematics
Problem
If
cos
x
=
−
15
4
\cos x = -\frac{\sqrt{15}}{4}
cos
x
=
−
4
15
and
π
2
<
x
<
π
\frac{\pi}{2} < x < \pi
2
π
<
x
<
π
, find the value of
sin
x
\sin x
sin
x
.
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