who can help me?

[elvinramazanov]

1) Let g(x) = cos(x/2) - 3x. Let f(x) = 2x + 5. What is g(f(x))?

2) Let f(x) = tan(x) - 2/x. Let g(x) = x^2 + 8. What is f(x)*g(y)?

 

[canvas]

1) g(f(x))=cos((2x+5)/2)-3(2x+5)=cos((2x+5)/2)-6x-15

 

[canvas]

2) f(x)*g(y)=[tan(x)-2/x](y^2+8)=...