Question

if f(x)= 4x^4 +3cosx + x(sinx)+1 show that f(x) is even or odd function ​

Answer 1

Answer:

f(-x)=4(-x)^4+3cos(-x)+(-x)sin(-x)+1

=4x^4+3cosx+xsinx+1

=f(x)

Therefore f(x) is even function.