Question
Question: cos (tan<sup>–1</sup> x) =\]...
cos (tan–1 x) =]
A
1+x2
B
1+x21
C
1 + x2
D
None of these
Answer
1+x21
Explanation
Solution
Let q = tan–1 x ̃ x = tan q
\ cos q = 1/1+tan2θ= 1/1+x2 = cos (tan–1 x)
cos (tan–1 x) =]
1+x2
1+x21
1 + x2
None of these
1+x21
Let q = tan–1 x ̃ x = tan q
\ cos q = 1/1+tan2θ= 1/1+x2 = cos (tan–1 x)