If f(x) = {(1, ",", "when" 0 lt x le (3p...

If `f(x) = {(1, ",", "when" 0 lt x le (3pi)/4),(2(sin) 2/9x, ",", "when" (3pi)/4 lt x lt pi):}`, then

f(x) is continuous at x = 0

f(x) is continuous at `x = pi`

f(x) is continuous at `x = (3pi)/4`

f(x) is discontinuous at `x = (3pi)/4`

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