Question

If cos A/2 = 1/2, find the value of sinA.

Answer 1

Answer:

cos A/2= cos 60

Step-by-step explanation:

A/2=60 A=120. sin120 find in log book

Answer 2

Answer:

Cos A/2 = 1/2

then,

A/2 = 60 ( because Cos 60 = 1/2 )

A = 120

Sin 120 = Sin (90 + 30)

            = $\sqrt{3/4}$

           =  $\sqrt{3}$/2