If the equation x^2 +4x sintheta + tanth...

If the equation `x^2 +4x sintheta + tantheta=0\ (0 < theta < pi/2)` has repeated roots, then `theta` equals (i)`pi/12` (ii)`pi/6` (iii)`pi/12 or (5pi)/12` (iv) `pi/6 or pi/12`

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