[" tan3A-tand ' cot3A-cotA "],[" xiii) "cos7^(@)cos14^(@)cos28^(@)cos56^(@)=(sin68^(@))/(16cos83^(@))]

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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^@))

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

cos56^(@)+cos58^(@)-cos66^(@)-4cos28^(@)cos29^(@)sin33^(@)=

(1+cos56^(@)+cos58^(@)-cos66^(@))/(cos28^(@)cos29^(@)sin33^(@))=

(1+cos56^(@)+cos58^(@) -cos66^(@))/(cos28^(@)cos29^@sin33^(@)) =

sin^(2)14^(@)+cos^(2)16^(@)-sin14^(@)cos16^(@)=

Prove that cos32^(@) sin20^(@) + cos144^(@) cos2^(@) + sin68^(@) cos56^(@) = 0

Show that 1+cos 56^(@)+ cos 58^(@)-cos66^(@)=4 cos 28^(@) cos 29^(@) sin 33^(@)