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सिद्ध कीजिए: cos510^(@) cos 330^(@) + s...

सिद्ध कीजिए: ` cos510^(@) cos 330^(@) + sin 390^(@) cos 120^(@) =-`

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cos120^(@)=

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

Prove that: cos510^(0)cos330^(@)+s in390^(@)cos120^(@)=-1

cos (120^(@)) is -

cos1^(@)*cos2^(@)*cos3^(@)* * * cos 120^(@) =________.

Prove that: (a) cos510^(@) sin510^(@) + sin(-330^(@)) cos(-390^(@))=0 b) tan(11pi)/(3) -2sin(9pi)/3-3/4"cosec"^(2)pi/4 + 4cos^(2)(17pi)/6=(3-2sqrt(3))/2

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

The value of cos 480^(@) sin 150^(@) + sin 600^(@) cos 390^(@) is

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

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

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