Question

sin 20. sin 100. sin 140. sin 60 please give me answer this question with solution​

Answer 1

Step-by-step explanation:

sin 20. sin 100. sin 140. sin 60

let's ignore sin140 for a while

sin 60 sin(60+A) sin(60-A) = sin3A/4

sin 20. sin 100.sin 60 = sin3×40/4

= 1/2/4.........(1)

sin140 = sin(90+60)

sin(A+B) = sinA cosB + cosA sinB

= 1× 1/2 + 0

= 1/2

1/2/4 × 1/2

0.125 × 0.5

0.0625

So value of

sin 20. sin 100. sin 140. sin 60 is 0.0625

hope it helps you buddy