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Given y = 4 for all real values of x, Ca...

Given y = 4 for all real values of x, Can y be regarded as a function of x ? Give reasons.

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  14. If f(x)=5^x , then prove : f(x+y)=f(x).f(y)

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  19. If phi(x)=logex, then show: phi(x^m)= mphi(x)

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