Practicing Success
Practicing Success
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The area of the loop of the curve $x^2+(y-1)y^2=0$ is equal to: |
8/15 sq. units 15/8 sq. units 4/15 sq. units None of these |
8/15 sq. units |
$x=±y\sqrt{1-y}$. Defined for y ≤ 1. $A=\int\limits_0^12y\sqrt{1-y}dy$ put 1 - y = t2
$⇒A=-\int\limits_1^04t^2(1-t^2)dt=\int\limits_0^1(4t^2-4t^4)dt=\frac{4t^3}{3}-\frac{4t^5}{t}|_0^1=\frac{8}{15}$ |
