sinθ= - 1/4
Original formula = [(-cosθ)/cosθ * (cosθ-1)]+[cosθ/(-cosθ)+cosθ)]
=[ 1/( 1+cosθ)]+[ 1/( 1-cosθ)]
=[( 1-cosθ+ 1+cosθ)/( 1+cosθ)( 1-cosθ)]
=[2/( 1-cos^2(θ)]
=2/[sin^2(θ)]
=2/( 1/ 16)
=32