Question

give me answer but explain

Answer 1

Answer:

Step-by-step explanation:

(a+b)3+(b+c)3+(c+a)3-3(a+b)(b+c)(c+a)=put x=a+b,y=b+c,z=c+a

x3+y3+z3-3xyz is the formula in 9th st.

=a3+b3+b3+c3+c3+a3-3abc-3abc

=2(a3+b3+c3-3abc)

hence proved

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