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Mathematics
Mathematics
Problem
If
sin
θ
=
k
\sin \theta = k
sin
θ
=
k
and
θ
\theta
θ
lies in the second quadrant, which of the following represents
cos
θ
\cos \theta
cos
θ
in terms of
k
k
k
? a)
−
1
−
k
2
-\sqrt{1-k^{2}}
−
1
−
k
2
b)
1
−
k
2
\sqrt{1-k^{2}}
1
−
k
2
c)
−
1
+
k
2
-\sqrt{1+k^{2}}
−
1
+
k
2
d)
−
(
1
−
k
2
)
-(1-k^{2})
−
(
1
−
k
2
)
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