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(1)/(150^(@))+(11)/(11.cos120^(@)cos240^...

(1)/(150^(@))+(11)/(11.cos120^(@)cos240^(@)-sin120^(@)sin240^(@)=1)

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sin120^(@)cos150^(@)-cos240^(@)sin330^(@)=

cos510^(@)cos330^(@)+sin390^(@)cos120^(@)

Prove that cos120^@cos240^@-sin120^@sin240^@=1

sin120^(@)cos150^(@)-cos240^(@)sin330^(@)

sin150^(@).cos120^(@)+cos330^(@)*sin660^(@)=-1

cos120^(@)=cos(90^(@)+30^(@)) =-sin30^(@)=-(1)/(2)

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

sin 120^(@) cos 150^(@)- cos 240^(@) sin 330^(@) =

sin 240^@ + sin 120^@ =

tan^(2)120^(@)+cos^(2)150^(@)-sin^(2)300^(@)