sec(7A+28°)=cosec(30°-3A) then the value of A
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sec(7A+28) = cosec (30 - 3a)
sec (7a +28) = cosec (90-(30-3a)
sec(7a +28) = sec ( 60 +3a)
sec will be canceled
7a +28 = 3a +60
4a = 32
a = 32/4 =8
therefore a = 8
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hope it's clear........
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