How to Solve a Composite Function
129281
How to compose two functions?
27809
Find the function equation $f(x+f(y)+yf(x))=y+f(x)+xf(y)$
68235
Is there a way to solve for an unknown in a factorial?
44296
Solving a cubic polynomial equation.
114603
Conditional Expectation of Composite Function
27963
How many ways a composite number can be resolved into two factors which are prime to each other?
98255
Find $f(x)$ such that $f(f(x)) = x^2 - 2$
157744
Cauchy's functional equation with composite function: $gf(x+y)=gf(x)+gf(y)$
94585
Solving for a variable that's an exponent
24862
Solving (quadratic) equations of iterated functions, such as $f(f(x))=f(x)+x$
128751
Solving for $f(2004)$ in a given functional equation
28286
About finding the function such that $f(xy)=f(x)f(y)-f(x+y)+1$
129454
Solution to a quadratic form
101299
Solving the complex polynomial
111556
Solving functional equation $f(x+y)+f(x-y)=2f(x)\cos y$?
66933
Solving an exponential equation with different bases
61533
Solution af a system of 2 quadratic equations