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" (a) "cos7^(@)*cos14^(@)*cos28^(@)*cos5...

" (a) "cos7^(@)*cos14^(@)*cos28^(@)*cos56^(@)=(sin68^(@))/(16cos88^(@))

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Prove that: cos7^(0)cos14^(0)cos28^(0)cos56^(@)=(s in68^(0))/(16cos83^(@))

Prove the following: cos7^@cos14^@cos28^@cos56^@=(frac(sin68^@)(16cos83^@))

1+cos56^(@)+cos58^(@)-cos66^(@)=?

cos52^(@)+cos68^(@)+cos172^(@)=?

(cos 28^(@))/(sin 62^(@))=?

Prove that: \ cos7^0cos 14^0cos 28^0cos 56^0=(sin 68^0)/(16cos83^0)

cos52^(@) + cos68^(@) + cos172^(@)=

(1+cos 56^(@)+cos58^(@)-cos66^(@))/(cos28^(@)cos29^(@)sin33^(@))=kcos(A/2)cos(B/2)sin(c/2) then k=?

The value of (sin22^(@)cos8^(@)+cos158^(@)cos98^(@))/(sin23^(@)cos7^(@)+cos157^(@)cos97^(@))

The value of (sin22^(@)cos8^(@)+cos158^(@)cos98^(@))/(sin23^(@)cos7^(@)+cos157^(@)cos97^(@))