Question

sinπ/5.sin2π/5.sin3π/5.sin3π/5=5/16​

Answer 1

Answer:

Sin pi/5. sin2pi/5 . sin3pi/5. sin4pi/5 = ?

= Sin pi/5. sin2pi/5 . sin(pi - 2pi/5). sin(pi -pi/5) =

= Sin pi/5. sin2pi/5 . sin2pi/5. sinpi/5 =

= (sinpi/5)^2*(sin2pi/5)^2 =(0.587785)^2*(0.95106)^2 =

= 0.3125