Write the correct alternative in the following:

If then

Write the correct alternative in the following:

If y = a sin mx + b cos mx, then is equal to

Write the correct alternative in the following:

If then (1 – x²) f’ (x)– xf(x) =

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