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\left(x^{2}\right)^{3}-6\left(x^{2}\right)^{2}+12x^{2}-8
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x^{2}-2\right)^{3}.
x^{6}-6\left(x^{2}\right)^{2}+12x^{2}-8
To raise a power to another power, multiply the exponents. Multiply 2 and 3 to get 6.
x^{6}-6x^{4}+12x^{2}-8
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.
\left(x^{2}\right)^{3}-6\left(x^{2}\right)^{2}+12x^{2}-8
Use binomial theorem \left(a-b\right)^{3}=a^{3}-3a^{2}b+3ab^{2}-b^{3} to expand \left(x^{2}-2\right)^{3}.
x^{6}-6\left(x^{2}\right)^{2}+12x^{2}-8
To raise a power to another power, multiply the exponents. Multiply 2 and 3 to get 6.
x^{6}-6x^{4}+12x^{2}-8
To raise a power to another power, multiply the exponents. Multiply 2 and 2 to get 4.