If cos-1x-cos-1y-cos-1z - 3- then the value of xy-yz-zx is

If x=y=z= 1 then #160; cos^ 1( 1)+cos^ 1( 1)+cos^ 1( 1)=3π The value of xy+yz+zx=( 1)( 1)+( 1)( 1)+( 1)( 1)=3 ...

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Trigonometric Equations

If cos-1x+c...

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If ${cos}^{- 1} x + {cos}^{- 1} y + {cos}^{- 1} z = 3 π$ then the value of $x y + y z + z x$ is

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