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[cos35^(@)+cos85^(@)+cos155^(@)=],[[" (1...

[cos35^(@)+cos85^(@)+cos155^(@)=],[[" (1) "0," (ii) "(1)/(sqrt(3))" (iii) "(1)/(sqrt(2))," (i) "" comsir "]]

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Prove that cos35^(@)+cos85^(@)+cos155^(@)=0

sin5^(@)cos85^(@)+cos5^(@)sin85^(@)

Show that cos 35^(@) + cos 85^(@) + cos 155^(@) = 0

cos25^(@)cos35^(@)cos85^(@) is equal to

cos35^(0)+cos85^(0)+cos155^(@)a*0b*(1)/(sqrt(2))c(1)/(sqrt(3))d*cos275^(0)

Prove that sin85^(@) - cos65^(@) +cos55^(@)=0

Find sin 5^(@) cos 85^(@) +cos 5^(@) sin 85^(@)

sin 85^(@)-sin 35^(@) - cos 65^@