Question

prove that : sin20 sin40 sin60 sin80 = 3/16

Answer 1

sin20. sin 40. sin60. sin80

=> sin60[sin20.sin40.sin80]

=>√3/2[sin20.sin(60-20).sin(60+20)]

=>√3/2[sin 3(20)/4]

=>√3/2[sin 60/4]

=>√3/2[√3/2*4]

=>√3/2*√3/8

=3/16
 
hope it's help u

Answer 2

Answer:

Step-by-step explanation: