Write the correct alternative in the following:

If x = a cos nt – b sin nt, then is

If x = sin, show that (1–x²)y₂–xy₁–a² y = 0

If log y = tan^–1 X, show that : (1+x²)y₂+(2x–1) y₁=0.

Write the correct alternative in the following:

If x = at², y = 2at, then

Write the correct alternative in the following:

If y = axⁿ⁺¹ + b x^–n, then