sin π/14 * sin 3π/14 * sin 5π /14
Answers
Answered by
0
Hello mate
Convert sin 3pi/14 into cos 4pi/14.
Convert sin 5pi/14 into cos 2pi/14
now problem has become sin pi/14 cos 4pi/14 cos 2pi/14
assume pi/14 as x
sin x cos 2x cos 4x
divide and multiply by cos x and 2
(2sin x cos x cos 2x cos 4x)/2 cos x
2 sin 2x cos 2x cos 4x/4 cos x
sin 4x cos 4x 2 / 8 cos x
sin 8x/8 cos x
(sin 8pi/ 14)/8 cos pi/14
convert sin 8pi/14 into cos pi/14
so
1/8
Hope this helps you.....
Similar questions