Reduction of Order: Second Solution Use the steps o r the formula for y2 developed in Problem

Question:

Reduction of Order: Second Solution Use the steps o r the formula for y2 developed in Problem 75 to find a second linearly independent solution to the second-order differential equations of Problems 1-3 for which y1 is a known solution. Put the DE in standard form before using the formula.
1. y′′ − 6y′ + 9y = 0 , y1 = e3t
2. y′′ − 4y′ + 4y = 0, y1 = e2t
3. t2y′′ − ty′ + y = 0 , y1 = t