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\left(x^{\frac{3}{2}}\right)^{2}-2x^{\frac{3}{2}}x^{-\frac{3}{2}}+\left(x^{-\frac{3}{2}}\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x^{\frac{3}{2}}-x^{-\frac{3}{2}}\right)^{2}.
x^{3}-2x^{\frac{3}{2}}x^{-\frac{3}{2}}+\left(x^{-\frac{3}{2}}\right)^{2}
To raise a power to another power, multiply the exponents. Multiply \frac{3}{2} and 2 to get 3.
x^{3}-2+\left(x^{-\frac{3}{2}}\right)^{2}
Multiply x^{\frac{3}{2}} and x^{-\frac{3}{2}} to get 1.
x^{3}-2+x^{-3}
To raise a power to another power, multiply the exponents. Multiply -\frac{3}{2} and 2 to get -3.
\left(x^{\frac{3}{2}}\right)^{2}-2x^{\frac{3}{2}}x^{-\frac{3}{2}}+\left(x^{-\frac{3}{2}}\right)^{2}
Use binomial theorem \left(a-b\right)^{2}=a^{2}-2ab+b^{2} to expand \left(x^{\frac{3}{2}}-x^{-\frac{3}{2}}\right)^{2}.
x^{3}-2x^{\frac{3}{2}}x^{-\frac{3}{2}}+\left(x^{-\frac{3}{2}}\right)^{2}
To raise a power to another power, multiply the exponents. Multiply \frac{3}{2} and 2 to get 3.
x^{3}-2+\left(x^{-\frac{3}{2}}\right)^{2}
Multiply x^{\frac{3}{2}} and x^{-\frac{3}{2}} to get 1.
x^{3}-2+x^{-3}
To raise a power to another power, multiply the exponents. Multiply -\frac{3}{2} and 2 to get -3.