If cotθ=78\cot \theta = \dfrac{7}{8}cotθ=87, evaluate:
(i) (1+sinθ)(1−sinθ)(1+cosθ)(1−cosθ)\dfrac{(1 + \sin \theta)(1 - \sin \theta)}{(1 + \cos \theta)(1 - \cos \theta)}(1+cosθ)(1−cosθ)(1+sinθ)(1−sinθ)
(ii) cot2θ\cot^2 \thetacot2θ