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" (b) "cos(-65^(@))...

" (b) "cos(-65^(@))

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Distance between the points (a cos 35^(@), 0) and B(0,a cos 65^(@)) is

Evaluate |(sin 25^(@) cos 25^(@)),(-sin 65^(@) cos 65^(@))| .

cos 25^(@) - cos65^(@) =

(sin 65^(@) + sin 25^(@))/( cos 65^(@) + cos 25^(@))=

Evaluate |["cos" 65^(@), "sin"65^(@)],["sin"25^(@), "cos"25^(@)]|

Evaluate: sin 25^(@) cos 65^(@) + cos 25^(@) sin 65^(@) .

cos 55^(@) + cos 65^(@) + cos 175^(@)= A)0B)1C) sin 18^(@) D) cos 36 ^(@)

proof cos65 ^ (@) + cos115 ^ (@) = 0

((sin25^(@))/(cos65^(@)))^(2)+((tan65^(@))/(cot25^(@)))^(2)-2cos^2 45^@=

Prove that cos 55^(@)+cos65^(@)+cos175^(@)=0