Question

Domain and range of 1 +3cos2x

Answer 1

see  domain of the function will contain all the numbers or values on which the function is defined .....hence 1 is an integer ...and cos 2x will be defined on all the real numbers and hence domain = real 

Answer 2

Answer:

Domain of the function will contain all the numbers or values on which the function is defined .Therefore, 1 is an integer ...and cos 2x will be defined on all the real numbers and hence domain = real