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[" ve that "],[qquad [tan720^(@)-cos270^...

[" ve that "],[qquad [tan720^(@)-cos270^(@)-lin150cos120],[=(1)/(4)]]

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Prove that: tan720^(@)-cos270^(@)-s in150^(@)cos120^(@)=(1)/(4)

Prove that: t a n 720^0-cos 270^0-sin 150^0cos 120^0=1/4

Prove that: t a n 720^0-cos 270^0-sin 150^0cos 120^0=1/4

Prove that: t a n 720^0-cos 270^0-s in 150^0cos 120^0=1/4

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

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

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

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

cos^(3)A+cos^(120+A)+cos^(240+A)=(3)/(4)cos3A

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