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Explanation & Answer
18--
sin29=10/PQ
PQ = 10/sin29, Answer: C
19--
sin42=2/x
x = 2/sin42
x = 3.0
20--
sin53=11/x
x = 11/sin53
x = 13.8
21--
cos39 = x/26
x = 26*cos39
x = 20.2
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