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Mathematics
Mathematics
Problem
Without performing full expansion, explain why the expression
sin
(
45
∘
+
θ
)
+
sin
(
45
∘
−
θ
)
\sin(45^{\circ}+\theta)+\sin(45^{\circ}-\theta)
sin
(
4
5
∘
+
θ
)
+
sin
(
4
5
∘
−
θ
)
is an even function of
θ
\theta
θ
.
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