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Mathematics
Problem
If
sin
2
A
=
1
2
tan
2
45
∘
\sin 2A = \frac{1}{2} \tan^2 45^\circ
sin
2
A
=
2
1
tan
2
4
5
∘
where A is an acute angle, then the value of A is (a)
60
∘
60^\circ
6
0
∘
(b)
45
∘
45^\circ
4
5
∘
(c)
30
∘
30^\circ
3
0
∘
(d)
15
∘
15^\circ
1
5
∘
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