Sec 2A = Cose CA-27 ) where 2 A is acute angle the measure of angle A is
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Sec 2A = Cosec (A-27)
Sec(90°-2A)=cosec(A-27°)
cosec (90°-2A) = Cosec (A-27)
90°-2A=A-27°
90°+27°=2A+A
117°=3A
117°/3=39°=A.
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