Question
Question: \(\sec^{2}\left( \tan^{- 1}2 \right) + \cos ec^{2}\left( \cot^{- 1}3 \right)\)is equal to...
sec2(tan−12)+cosec2(cot−13)is equal to
A
1
B
5
C
10
D
15
Answer
15
Explanation
Solution
The given expression is equal to
1+[tan(tan−12)]2+1+[cot(cot−13)]2
= 1+ 4 +1 9 = 15