If
csc
(
x
)
=
7
,
\displaystyle {\csc{{\left({x}\right)}}}={7},
csc
(
x
)
=
7
,
for
90
∘
<
x
<
180
∘
,
\displaystyle {90}^{\circ}\lt{x}\lt{180}^{\circ},
90
∘
<
x
<
180
∘
,
then
sin
(
x
2
)
=
\displaystyle {\sin{{\left(\frac{{x}}{{2}}\right)}}}=
sin
(
2
x
)
=
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