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If sec4A `="cosec"(A-20^@)` where 4A is an acute angle , find the value of A.

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`sec4A="cosec "(A-20^(@))`
`rArr"cosec "(90^(@)-4A)="cosec " (A=20^(@))rArr90^(@)-4A=A-20^(@)`
`rArr110^(@)=5ArArrA=22^(@)`

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