Answer:
(4) 0
Step-by-step explanation:
Given:
- cos²27°×cos²34°×...×cos²167 = ?
Looking at the angles measures, they form series of:
This is AP with the first term of 27 and common difference of 7
We can see one of the terms of this AP is 90
Since cos 90° = 0 ⇒ cos²90° = 0 and therefore given series equals to zero as one of the terms of multiplication is zero.
So correct answer choice is Option 4) 0
