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[x=cos55^(@),y=cos65^(@),z=cos175^(@)],[...

[x=cos55^(@),y=cos65^(@),z=cos175^(@)],[rArr xy+yz+zx=]

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x=cos55^(@),y=cos65^(@),z=cos175^(@) then xy+yz+xz=

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x = cos 55^(@), y = cos 65^(@), z= cos 175^(@) " then " xy+yz+ zx=

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If p=cos55^(@),q=cos65^(@)andr=cos175^(@) , then the value of (1)/(p)+(1)/(q)+(r)/(pq) is

Prove that, cos55^(@)+cos65^(@)+cos175^(@)=0

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