if x belongs to (-pie/2,pie/2) then value of expression tan^-1 (tan x/4) + tan^-1 ( 3sin2x/5+3cos2x) is ?
if x belongs to (-pie/2,pie/2) then value of expression tan^-1 (tan x/4) + tan^-1 ( 3sin2x/5+3cos2x) is ?
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