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If sec2A=cosec(A-27), when 2A is an acut...

If `sec2A=cosec(A-27)`, when 2A is an acute angle, then the measure of `/_A` is

A

`35^@`

B

`37^@`

C

`39^@`

D

`21^@`

Text Solution

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int sec^(2)"cosec"^(2) x dx=