19)
x = 4 + y 2 x = 2 y 2 {\displaystyle \color {red}x=4+y^{2}\color {blue}x=2y^{2}}
∫ − 2 2 ( 4 + y 2 ) − ( y 2 ) {\displaystyle \int _{-2}^{2}(4+y^{2})-(y^{2})}
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