Consider the differential equation: y" + y = sinx Solve it using all three methods that we learned in the class - one by one. (a) Undetermined Coefficient (b) Variation of parameter (c) Reduction of order You should not use any formula for variation of parameter and reduction of order. Do the way we did in the class. If you are absent, make sure to watch the recorded video before doing the work. For any difficult integration, feel free to use "Wolfram Alpha", "Symbolab" or any other computing technology. 2. Solve the following 4th order linear differential equations using undetermined coefficients: y (4) - 2y""+y" = x² You should watch the recorded video that was sent for June 29 Wednesday in place of live session.