To Find: The value of cos (2)

Let , x = cos (2)

x = cos (+ )

Since we know that + =

+ = =

x = cos ()

Now , let y =

tan y =

By pythagorus theroem ,

(Hypotenuse )² = (opposite side )² + (adjacent side )²

Therefore, Hypotenuse = 5

cos ()=cos y =