If `cottheta=7/8`, evaluate:
(i) `((1+sintheta)(1-sintheta))/((1+costheta)(1-costheta))`
(ii) `cot^2theta`

Explanation

To solve the given problem step by step, we will evaluate both parts as follows:

### Given:
\[ \cot \theta = \frac{7}{8} \]

### Part (i):
...