Question
In the following match each item given under the column C1 to its correct answer given under the column C2:
| Column C1 | Column C2 | ||
| (a) | $\sin(\text{x + y})\sin\text{x}-\text{y}$ | (i) | $\cos^2\text{x}-\sin^2\text{y}$ |
| (b) | $\cos(\text{x + y})\cos(\text{x}-\text{y})$ | (ii) | $\frac{1-\tan\theta}{1+\tan\theta}$ |
| (c) | $\cot\Big(\frac{\pi}{4}+\theta\Big)$ | (iii) | $\frac{1+\tan\theta}{1-\tan\theta}$ |
| (d) | $\tan\Big(\frac{\pi}{4}+\theta\Big)$ | (iv) | $\sin^2\text{x}-\sin^2\text{y}$ |