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Mathematics
Mathematics
Problem
If
sin
θ
=
3
5
\sin \theta=\dfrac{3}{5}
sin
θ
=
5
3
and
0
∘
<
θ
<
90
∘
0^{\circ}<\theta<90^{\circ}
0
∘
<
θ
<
9
0
∘
, determine
cos
2
θ
\cos 2\theta
cos
2
θ
. a)
24
25
\dfrac{24}{25}
25
24
b)
7
25
\dfrac{7}{25}
25
7
c)
16
25
\dfrac{16}{25}
25
16
d)
−
7
25
-\dfrac{7}{25}
−
25
7
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