Which of the following formulas define functions equal to `cos^2(2x)` wherever defined?

Which of the following functions are defined for all x ?

Which of the following functions are defined for all x ?

Which one of the following does not reduce to sinx for every x, wherever defined, is

Which one of the following does not reduce to sinx for every x, wherever defined, is

Which one of the following does not reduce to sinx for every x , wherever defined, is

Which of the following functions has inverse function? a) f: ZrarrZ defined by f(x)=x+2 b) f: ZrarrZ defined by f(x)=2x c) f: ZrarrZ defined byy f(x)=x d) f: ZrarrZ defined by f(x)=|x|

Which of the following functions has inverse function? f:Z rarr Z defined by f(x)=x+2f:Z rarr Z defined by f(x)=2xf:Z rarr Z defined byy f(x)=xf:Z rarr Z defined by f(x)=|x|

Which of the following identieis, wherever defined, hold(s) good?

Which of the following identieis, wherever defined, hold(s) good?

Which of the following functions are onto? f:R rarr R defined by f(x)=2x+5