state gov RPSC 2nd Grade Senior Teacher Mock Test Series 2025 Mathematics Trigonometry Trigonometric Functions
Comprehension Passage
Consider the following for the next items that follow:
Let \(\rm p=\cos \left(\frac{\pi}{5}\right) \cos \left(\frac{2 \pi}{5}\right) \) and \(\rm q=\cos \left(\frac{4 \pi}{5}\right) \cos \left(\frac{8 \pi}{5}\right)\).
What is the value of pq?
1
\(-\frac{1}{16}\)
2
\(-\frac{1}{4}\)
3
\(\frac{1}{4}\)
4
\(\frac{1}{16}\)
5
Question Not Attempted