Question

If sin is equal to 1 by 2 cos b is equal to one upon to find a b and sin 2a

Answer 1

Sun A=1/2 CosB=1/2. Hence A=30 B=60 Sin2A=root3/2.

Answer 2

Answer:

A = 30

B = 60

sin 2A = root 3/2

Step-by-step explanation:

Given,

Sin A = 1 / 2 [ Let this be Eqn 1 ]

CosB = 1 / 2 [ Let this be Eqn 1 ]

We know,

sin 30 = 1/2

On comparing this with Eqn 1,We get

A = 30

Similarly,

We know,

cos 60 = 1 / 2

On comparing this with Eqn 2,We get B=60

As per given,

We also need to find sin 2A

sin 2 * 30 = sin 60

Since,

sin 60 = root 3 / 2

Therefore,

sin 2A = root 3/2

Hence,

A = 30

B = 60

sin 2A = root 3/2