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Q. The number of discontinuity of the function $y(x)$ on $[- 2$, $2]$ satisfying $x^2 + y^2 = 4$ is

Continuity and Differentiability

Solution:

Functions which satisfy the relation $x^2 + y^2 = 4$ are $y(x)=\sqrt{4-x^2}$ and $y(x)=-\sqrt{4-x^2}$.
And both functions are continuous in $[-2$, $2]$.