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Mathematics
Mathematics
Problem
If
sin
θ
=
3
5
\sin\theta=\dfrac{3}{5}
sin
θ
=
5
3
where
0
∘
<
θ
<
90
∘
0^{\circ}<\theta<90^{\circ}
0
∘
<
θ
<
9
0
∘
, calculate
cos
2
θ
\cos 2\theta
cos
2
θ
.
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