evaluate by using suitable identity -13^3 -8^3 +21^3
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since sum of -13,-8 qnd 21 is zero
Use if. a+b+c=0 then a^3+b^3+c^3is 3abc
now 3 × -13 × -8× 21
6552
Use if. a+b+c=0 then a^3+b^3+c^3is 3abc
now 3 × -13 × -8× 21
6552
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