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" (vii) "cos1395^(@)...

" (vii) "cos1395^(@)

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Find the value of : cos1395^(@)

Find cos 1395°

cos20 ^ (@) + cos40 ^ (@) + cos60 ^ (@) ............ + cos160 ^ (@) + cos180 ^ (@)

What is the value of cos46^(@)cos47^(@)cos48^(@)cos49^(@)cos50^(@)...cos135^(@) ?

cos 12 ^(@) cos 24 ^(@) cos 36 ^(@) cos 48^(@) cos 72^(@) cos 84^(@) = (1)/(2 ^(6))

A=cos 20^(@)cos 40^(@) cos60^(@)cos 80^(@) , B=cos6^(@)cos42^(@)cos66^(@)cos78^(@) and C=cos 36^(@)cos72^(@)cos 108^(@)cos 144^(@) then

cos 6^(@) * cos 42^(@) * cos 60^(@) * cos 66^@ * cos 78^@=