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[" Frove that : "],[" Prove that : "sin1...

[" Frove that : "],[" Prove that : "sin150^(@)cos120^(@)+cos330^(@)sin660^(@)+1=0],[" Drove that "tan315^(@)cot(-405^(@))+cot495^(@)tan(-585^(@))=]

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Prove that tan 315^(@) cot ( -405^(@) ) + cot 495^(@) tan (-585^(@)) = 2

Prove that: sin 150^@ cos 120^@+ cos 330^@ sin 660^@= - 1 .

Prove that: sin(-420^(@))cos390^(@)+cos(-660^(@))sin330^(@)=1

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

Prove that sin120^@ cos330^@ +cos240^@ sin330^@=1

Prove that: sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

Prove that sin(-420^(@))(cos390^(@))+cos(-660^(@))(sin330^(@))=-1

The value of sin600^(@)cos330^(@)+cos120^(@)sin150^(@) is

Prove that tan 225^(@) cot 405^(@)+tan 765^(@) cot 675^(@)=0.