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Mathematics
Mathematics
Problem
Given
sin
θ
=
4
5
\sin \theta = \dfrac{4}{5}
sin
θ
=
5
4
and
90
∘
<
θ
<
180
∘
90^{\circ} < \theta < 180^{\circ}
9
0
∘
<
θ
<
18
0
∘
, find
cos
θ
\cos \theta
cos
θ
.
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