Answers

2015-06-10T19:14:29+05:30
Sec 4A = cosec(A-20°)
or sec 4A = cosec (90
° - (A-20°))
or sec 4A = sec(110
° - A)
or 4A = 110
° - A
or 5A = 110
°
or, A = 22
°
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