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Mathematics
Problem
The expression
sin
(
α
+
θ
)
−
sin
(
α
−
θ
)
cos
(
β
−
θ
)
−
cos
(
β
+
θ
)
\frac{\sin(\alpha + \theta) - \sin(\alpha - \theta)}{\cos(\beta - \theta) - \cos(\beta + \theta)}
c
o
s
(
β
−
θ
)
−
c
o
s
(
β
+
θ
)
s
i
n
(
α
+
θ
)
−
s
i
n
(
α
−
θ
)
is – (A) independent of
α
\alpha
α
(B) independent of
β
\beta
β
(C) independent of
θ
\theta
θ
(D) independent of
α
\alpha
α
and
β
\beta
β
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