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cos 18^(@) ,sin 36^(@) sin 72^(@) cos 72...

`cos 18^(@) ,sin 36^(@) sin 72^(@) cos 72^(@) sin 54^(@)` और `cos 54^(@)` के मान ज्ञात कीजिए।

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cos 6^(@) sin 24^(@) cos 72^(@) =

cos6^(@)sin24^(@)cos72^(@)=

cos6^(@)*sin24^(@)*cos72^(@)=

cos 36^(@) - cos 72^(@) =

(sin 18^@)/( cos 72 ^@) = ?

2 cos 54^(@) * sin 66^(@) =

3 cos72^(@)-4" sin"18^(@)=

sin9^(@)+cos9^(@)=sqrt(2)sin54^(@)

cos36^(@)-cos72^(@)=

Show that cos 36^(@) cos 54 ^(@) -sin 36^(@) sin 54^(@) =0