The value of sin 20o.sin40o,sin60o.sin80o= - 1/16
- 3/16
- 1/8
- 1/4
The value of sin 20o.sin40o,sin60o.sin80o=
- 1/16
- 3/16
- 1/8
- 1/4
Satviki Pathak , 11 Years ago
Grade 11
Trigonometry> The value of sin 20 o .sin40 o ,sin60 o ....
1 Answers
Harsh Patodia
sin60 = 
/2
sin20sin40sin80
= sin20 sin(60-20)sin(60+20) = ¼ sin3(20) i.e ¼ sin60
(identity sin
sin (60 + ) sin(60 -) = ¼ sin 3)
You can simply from here
/2sin20sin40sin80
= sin20 sin(60-20)sin(60+20) = ¼ sin3(20) i.e ¼ sin60
(identity sin
sin (60 + ) sin(60 -) = ¼ sin 3)You can simply from here
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