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Discuss the continuity for f(x) = (1 - u...

Discuss the continuity for `f(x) = (1 - u^(2))/(2 + u^(2))`, where u = tan x.

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The correct Answer is:
`f(x) = {{:((1-u^(2))/(2+u^(2))",",x ne n pi +- (pi)/(2)),(-1",",x = npi +- (pi)/(2)and u = tan x):}`
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