Question

Prove 16sin10sin30sin50sin70sin90=1

Answer 1

sin 90=1 and sin 30=1/2
putting them you will get
8 sin 10 sin 50 sin 70 =1
:)

Answer 2

And how am I supposed to continue?

Answer 3

now 2sin 10 sin 50=???????

Answer 4

@ErkoT

Answer 5

That, my dear Sir, is an excellent question.

Answer 6

2 sin a sin b=cos(a-b)-cos(a+b)
put it there

Answer 7

4[cos40-cos 60]sin 70
now cos 60=1/2
2[2cos40-1]sin70
what is the value of 2cos2x-1=????????

Answer 8

@ErkoT

Answer 9

@Yahoo! do it..........!!!!!!!!!

Answer 10

cos^2x-3sin^2x?