Question

Write a value of sin20°sin40°sin80°.

Answer 1

Answer:

Step-by-step explanation:

sin20°.sin40°.sin80°

sin20°.sin(60-20)°.sin(60+20)°

=1/3sin(3*20)°

=(1/3)sin60°

=(1/3).(√3/2)

=√3/6

[WKT sinA.sin(60-A).sin(60+A)=1/3sin3A]