if x = 1, y = -1 and z = 0 find the value of 1/5[ x square + y square + z square]
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= 1/5[x square + y square + z square]
=putting the value of x y z
=1/5[ 1×1+(-1×-1)+0×0 ]
=1/5[1+(-1)+0]
=1/5[1-1+0]
=1/5[0]
=0
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