Trigonometry - Quant/Math - CAT 2008
Question 4 the day:
October 31, 2002
The question for the day is from the topic of Trigonometry.
- What is the value of cot 15o + cot 75o + cot 135o
- cosec 30o?
(1) |
3 |
|
(2) |
Infinity |
|
(3) |
1 |
|
(4) |
None of these |
Correct Answer - (3)
Solution:
cot 15 + cot (90 - 15) + cot (90 + 45) - cosec 30 = cot 15 + tan 15 - tan 45 -
cosec 30
= 2/Sin 30- 1 - 2 = 4 - 1 - 2 = 1.