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Mathematics
Problem
Explain why
csc
(
180
∘
+
θ
)
\csc(180^{\circ}+\theta)
csc
(
18
0
∘
+
θ
)
is negative if
0
∘
<
θ
<
90
∘
0^{\circ}<\theta<90^{\circ}
0
∘
<
θ
<
9
0
∘
.
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