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Engineering Maths · Q58

Calculus

Engineering and GATE · Engineering Maths · question 58

Q58

Let \[ g ( x ) = \ array*20c - x,& x 1\\ x + 1,& x 1 array .\] and \[ f ( x ) = \ array*20c 1 - x,& x 0\\ x^2,& x > 0 array ..\] Consider the composition of f and g i.e. (fog) (x) = f(g(x)). The number of discontinuities in (fog) (x) present in the interval (\[ - ,\] 0) is:

Let {\rm{g}}\left( {\rm{x}} \right) = \left\{ {\begin{array}{*{20}{c}} { - {\rm{x,}}}&{{\rm{x}} \le 1}\\ {{\rm{x}} + 1,}&{{\rm{x}} \ge 1} \end{array}} \right.     and {\rm{f}}\left( {\rm{x}} \right) = \left\{ {\begin{array}{*{20}{c}} {1 - {\rm{x,}}}&{{\rm{x}} \le 0}\\ {{{\rm{x}}^2},}&{{\rm{x}} > 0} \end{array}} \right..
Consider the composition of f and g i.e. (fog) (x) = f(g(x)). The number of discontinuities in (fog) (x) present in the interval (  0) is:
A.
0
Answer
B.
1
C.
2
D.
4

Answer: Option A

Solution

Answer: Option A
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