If f:R →R is defined by f(x) = x² and g:R → R is defined by g(x) = sinx, then find gof

Let f be exponential function and g be logarithmic function find fog(1)

Let f:{2, 3, 4, 5} → {3, 4, 5, 9} and g = {3, 4, 5, 9} → {7, 11, 15} be functions defined as f(2) = 3, f(3) = 4,
f(4) = f(5) = 5 and g(3) = g(4) = 7 and g(5) = g(11) = 11 .Find gof(3)

Let F: x →y be a given function, then f-^-1 exists ( or f is invertible) if

If f:R → R is defined by f(x) = x² - 3x + 2 then f(f (x)) = _______.