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Sec4A = Cosec(A-20°) |
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Answer» Sec4A=cosec(A-20°)Cosec(90°-4A)=cosec(A-20°)90°-4A=cosec(A-20°)÷cosec90°-4A=A-20°-4A-A=-20°-90°-5A=-110°5A=110°A=110°÷5A=22 •••A=22(Answer) The value of A is 22°. |
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