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 y = a + bx², a, b arbitrary constants, then

Write the correct alternative in the following:

If f(x) = (cos x + i sinx) (cos 2x + i sin 2x) (cos 3x + i sin 3x) …. (cos nx + i sin nx) and f(1) = 1, then f’’ (1) 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:

If then