Mathematical expectation?

Need to find a mate. the expectation in this formula. Where in the end come from (16-1) and why x^2 became x^4?
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April 7th 20 at 15:20
1 answer
April 7th 20 at 15:22
Where in the end come from (16-1)

Cm. definite integral and the formula of Newton — Leibniz.

why does x^2 become x^4?

Cm. list of integrals of elementary functions.

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