Complete the equation by filling the given blank.
(1−sinθ+cosθ)2 = ___(1+cosθ)(1−sinθ).
LHS=(1−sinθ+cosθ)2
⇒LHS=1+sin2θ+cos2θ−2sinθ+2cosθ−2sinθcosθ
⇒LHS=2−2sinθ+2cosθ−2sinθcosθ
⇒LHS=2(1−sinθ)+2cosθ(1−sinθ)
⇒LHS=2(1−sinθ)(1+cosθ)=RHS
So, the required number is 2