Mark the Correct alternative in the following:
The value of sin 50o – sin 70o + sin 10o is equal to
sin 50° - sin 70° + sin 10°
= (sin 50° + sin 10°) – sin 70°
= 2sin 30° cos 20° - sin (90° - 20°)
= 2 ⋅ 1/2 ⋅ cos 20° - cos 20°
= cos 20° - cos 20°
= 0