1.

Find the general value of x if the expression (sin ""(x)/(2) + cos"" (x)/(2) + itan x)/( 1 + 2isin "" (x)/(2)) is real .

Answer»

`NPI" or " npipi/4`
`2NPI" or " npipi/4`
`npi" or " npipi/2`
NONE

ANSWER :B


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