Write the correct alternative in the following:

If then (2xy₁ + y)y₃ =

Write the correct alternative in the following:

If y = e^{tan x}, then (cos² x)y₂ =

Write the correct alternative in the following:

If a > b > 0, then

Write the correct alternative in the following:

If then x³ y₂ =

Write the correct alternative in the following:

If x = f(t) cos t – f’(t) sin t and y = f(t) sin t + f’(t) cos t, then