If sin alpha = 1/2 and cos beta = 1/2, then the value of (alpha + beta) is
(a) 0
(b) 30
(c) 60
(d) 90
Answer :
Sin alpha = 1/2
Sin alpha = sin 30°
Alpha = 30°
Cos alpha = 1/2
Cos beta = cos 60°
Beta = 60°
Now, alpha + beta
= 30°+60°
= 90°
More Solutions:
- Taking A = 30°, verify that
- If A = 45° and B = 30°
- Taking A = 60° and B = 30°, verify that
- Find the value of sin θ + √3 cos θ – 2 tan2 θ.
- Solve the following equations for θ:
- If tan (A + B) = √3 and tan (A – B) = 1
- Without using trigonometrical tables.
- Prove that:
- Solve the following equations:
- Find the value of θ if