Question

Which of the given relation is true?
1. cos 1° < cos 1
2. cos 1° = cos 1
3. cos 1° > cos 1
4. \(\cos 1^\circ=\dfrac{\pi}{180}\sin 1\)

Answer 1

Correct Answer - Option 3 : cos 1° > cos 1

Concept: 

We know that, π^radian = 180° 

⇒ 1 = 180°/π = 57.3° 

cos 1° = 0.999                    ------(i)

cos 1 = cos 57.3° = 0.540                     -------(ii)

Calculation:

From Eqn (i) and (ii) we can say that cos 1° > cos 1