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" xiii) "cos7^(@)cos14^(@)cos28^(@)cos56...

" xiii) "cos7^(@)cos14^(@)cos28^(@)cos56^(@)=(sin68^(@))/(16cos83^(@))quad " Let "

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

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

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

cos7^(@)cos23^(@)cos45^(@)cosec83^(@)cosec67^(@)=?

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

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

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

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

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