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Problem
Problem
The expression
n
sin
2
θ
+
2
n
cos
(
θ
+
α
)
sin
α
sin
θ
+
cos
(
2
(
α
+
θ
)
)
n \sin^2 \theta + 2n \cos(\theta + \alpha) \sin \alpha \sin \theta + \cos\bigl(2(\alpha + \theta)\bigr)
n
sin
2
θ
+
2
n
cos
(
θ
+
α
)
sin
α
sin
θ
+
cos
(
2
(
α
+
θ
)
)
is independent of
θ
\theta
θ
, the value of
n
n
n
is a. 1 b. 2 c. 3 d. 4
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