Question
Prove : $\sec \theta+\tan \theta=\frac{1}{\sec \theta-\tan \theta}$
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Class | 0-20 | 20-40 | 40-60 | 60-80 | 80-100 | 100-120 |
| Frequency | 5 | $f_1$ | 10 | $f_2$ | 7 | 8 |