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Which of the following mathematical function is overloaded in <complex> and <valarray>?

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Which of the following mathematical function is overloaded in <complex> and <valarray>?

(a) cos

(b) tan

(c) sin

(d) mod

I had been asked this question in an interview for job.

The above asked question is from Standard Mathematical Functions in chapter Strings, Streams & Numerics in C++ of C++

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The correct choice is (b) tan

The explanation is: Because tan has more different definition in normal case and in case of complex number i.e. tan = sin/cos(normally) and tan = y/x in complex numbers.

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