Solveeit Logo

Question

Question: \(\sec^{2}\left( \tan^{- 1}2 \right) + \cos ec^{2}\left( \cot^{- 1}3 \right)\)is equal to...

sec2(tan12)+cosec2(cot13)\sec^{2}\left( \tan^{- 1}2 \right) + \cos ec^{2}\left( \cot^{- 1}3 \right)is equal to

A

1

B

5

C

10

D

15

Answer

15

Explanation

Solution

The given expression is equal to

1+[tan(tan12)]2+1+[cot(cot13)]21 + \left\lbrack \tan\left( \tan^{- 1}2 \right) \right\rbrack^{2} + 1 + \left\lbrack \cot\left( \cot^{- 1}3 \right) \right\rbrack^{2}

= 1+ 4 +1 9 = 15