Write the correct alternative in the following:

If x = t², y = t³, then

Write the correct alternative in the following:

If y = axⁿ⁺¹ + b x^–n, then

Write the correct alternative in the following:

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