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Mathematics
Mathematics
Problem
Find
sin
θ
\sin \theta
sin
θ
if
cos
θ
=
−
4
5
\cos \theta = -\dfrac{4}{5}
cos
θ
=
−
5
4
and
90
∘
<
θ
<
180
∘
90^{\circ} < \theta < 180^{\circ}
9
0
∘
<
θ
<
18
0
∘
.
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