Question

if sin alpha=0.5 then find the values of sin 3alpha and cos 3alpha​

Answer 1

Step-by-step explanation:

sin alpha= 0.5

sin alpha= 1/2

sin alpha = sin 30

or, alpha = 30

then sin3×alpha= sin(3×30)

= sin 90

= 1(ans)

cos 3alpha= cos 90

= 0 (ans)