Write the correct alternative in the following:

If y = a cos (log_e x) + b sin (log_e x), then x² y₂ + xy₁ =

Write the correct alternative in the following:

If then

Write the correct alternative in the following:

Let f(x) be a polynomial. Then, the second order derivative of f(e^x) is

Write the correct alternative in the following:

If x = 2at, y = at², where a is a constant, then

Write the correct alternative in the following:

If x = f(t) and y = g(t), then is equal to