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{2sin9*sin21*sin39*sin51*sin69*sin81}/si...

`{2sin9*sin21*sin39*sin51*sin69*sin81}/sin54 =`

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(4sin9^(@)sin21^(@)sin39^(@)sin51^(@)sin69^(@)sin81^(@))/(sin54^(@))

(4sin9^(@)sin21^(@)sin39^(@)sin51^(@)sin69^(@)sin81^(@))/(sin54^(@))

(4sin9^(@)sin21^(@)sin39^(@)sin51^(@)sin69^(@)sin81^(@))/(sin54^(@))

Value of (4\ sin 9^@ sin 21^@ sin 39^@ sin 51^@ sin 69^@ sin 81^@)/(sin 54^@) is equal to

(sin A sin2A + sin3A sin6A + sin4A sin13A) / (sin A cos2A + sin3A cos6A + sin4A cos13A) = tan9A

sin12^(@)sin48^(@)sin54^(@)=

sin12^(0)sin48^(@)sin54^(@)=

Find sin12^@ sin48^@ sin54^@

(sin6A+sin2A+2sin4A)/(sin7A+sin3A+2sin5A)=(sin4A)/(sin5A)