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Mathematics
Mathematics
Problem
If
cos
2
x
=
3
5
\cos 2x=\dfrac35
cos
2
x
=
5
3
and
x
x
x
lies in the first quadrant, what is
sin
x
\sin x
sin
x
? a)
2
5
\dfrac{2}{\sqrt5}
5
2
b)
3
10
\sqrt{\dfrac{3}{10}}
10
3
c)
5
5
\dfrac{\sqrt5}{5}
5
5
d)
2
5
\sqrt{\dfrac{2}{5}}
5
2
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