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I stink at integration. Here we have the marginal Distribution getting solved for y. Highlighted in yellow is where I'm stuck. How did they get

I stink at integration. Here we have the marginal Distribution getting solved for y. Highlighted in yellow is where I'm stuck. How did they get from 21/4 [x^2y^4] I1 x To 21/4[x^2 -x^6] ? How were they able to get random variable y out ?
arghial distribution of . fx (x) = 21x y dy 21 ry' dy 21 1 21 32 - 26 ] 21 r? (21 - 1) 4

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