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[" (jii) "cos24^(@)+cos55^(@)+cos125^(@)...

[" (jii) "cos24^(@)+cos55^(@)+cos125^(@)+cos204^(@)+cos300^(@)-2],[" (iv) "tan(-225^(@))cot(-405^(@))-tan(-765^(@))cot(675^(@))=0]

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Prove that: tan(-225^(@))cot(-405^(@))-tan(-765^(@))cot(675^(@))=0

cos24^(0)+cos5^(0)+cos175^(0)+cos204^(0)+cos300^(@)

tan225^(@)cot405^(@)+tan765^(@)cot675^(@)=0

Prove that tan225^(@)cot405^(@)+tan765^(@)cot675^(@)=0

Evaluate : cos24^(@)+cos55^(@)+cos125^(@)+cos204^(@)+cos300^(@) .

Prove that: tan(-225^0)cot(-405^0)-tan(-765^0)cot(675^0)=0

Prove that: tan225^(@)cot405^(@)+tan765^(@)cot675^(0)=0

Prove that cos24^(@) + cos 55^(@) + cos125^(@) +cos204^(@) + cos300^(@) = 1/2