1the given expression is itself equal to the reqd. expression. Hence it's possible for the range in which both sin theta and cos theta exists ,i.e, (d).
The set of values possible of θ in [-Î ,Î ], such that √1-sin θ√1+sin θ is equal to sec θ- tan θ is
a)[0,Î /2]
b)[0,Î /2)Ï
(Î /2,Î ]
c)[-Î ,0]
d)(-Î /2, Î /2)
ans d
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