Find a^4+b^4+c^4
Solve it.
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Answer:
a^4+b^4+c^4
= (a²+b²+c²)²-2(a²b²+b²c²+c²a²)
= {(a+b+c)²-2(ab+bc+ca)}²
-2(a²b²+b²c²+c²a²)
= (a+b+c)^4+4(ab+bc+ca)²
-4(ab+bc+ca)(a+b+c)²
-2(a²b²+b²c²+c²a²)
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