Hints: use the calculator to check if any of the options are correct. Try x=pi/6 (or 30 degrees).
Odd functions satisfy the property f(x)=-f(-x) For this reason, odd functions are symmetrical about the origin. Examples of odd functions: sin(x), x^3, x+3x^5, tan(x), sin(x)*cos(x), x*sin(x) (use your calculator to check that the above are true).
Even functions satisfy the property f(x)=f(-x) Even functions are symmetrical about the y-axis. Examples: x^2, cos(x), x^4+2, |x|, sin^2(x), x^2*cos(x)
There are functions that are neither odd nor even, examples: x^2+4x+3, sin(x)+cos(x)
