please help me to solve this please fast
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a^2+b^2+c^2-bc-ca-ab
------->(2)^2+(-1)^2+(4)^2-(-1)(4)-(4)(2)-(2)(-1)
------->4+1+16-(-4)-8-(-2)
------->4+1+16+4-8+2
------->5+20-8+2
------->27-8
------->19
HOPE THIS HELP YOU OUT
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