f(x)=-6
f(x)=1/x^2
f(x)=sinx
f(x)=1/(〖cos〗^2 x)
f(x)=x^2
f(x)=x^9
f(x)=14^x
f(x)=x^7
f(x)=1/x^59
f(x)=√(5&x^2 )
f(x)=x^16+1/√x-cosx+1
f(x)=e^x+x^5+4
f(x)=7+cosx
f(x)=7cosx
f(x)=10x^2-4x-2
f(x)=2x^3-6x^5-8x-3
f(x)=x/2-4/x+1/3x+5
f(x)=1/x^7 -5/x^4
f(x)=x^2/4+5x^(-3)+0,5