Mark the tick against the correct answer in the following:
To Find: The value of cos(
)
Let x = 
tan x = 
tan x = 
= 
We know that by pythagorus theorem ,
(Hypotenuse )2 = (opposite side )2 + (adjacent side )2
Therefore, Hypotenuse = 5
cos x = 
= 
Since here x = 
hence cos(
) becomes cos x
Hence , cos(
) = cos x = 
1