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Q)
cos
−
1
(
−
1
2
)
−
2
sin
−
1
(
1
2
)
+
3
cos
−
1
(
−
1
√
2
)
−
4
tan
−
1
(
−
1
)
=
(
1
)
19
π
12
(
2
)
35
π
12
(
3
)
47
π
12
(
4
)
43
π
12
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