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  1. Mimi_x3
    • one year ago
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    help pls <3

  2. Loser66
    • one year ago
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    Verify part: y= sin (x^2) , hence y ' = 2x cos (x^2), y"= 2cos(x^2) -4x^2 sin(x^2) Plug back \(x(2cos (x^2) - 4x^2 sin(x^2) -2x cos(x^2) +4x^3 sin(x^2) =0\)

  3. Loser66
    • one year ago
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    Reduction Order: Let the second solution is \(y_2 = V(t) y_1(t)\) , then we have (this is formula, but if you want, you can take \(y_2 ', y_2" \) and plug to the original one to get the form, \(y_1V" + (2y_1' +y_1)V'=0\) That is \(sin(x^2) V" +(2xcos(x^2) + sin(x^2))V' =0\) Now let \(W = V'\rightarrow W'= V" (1)\) We have \(sin(x^2) W' + (2xcox (x^2) + sin(x^2) W =0\) \(\dfrac{dW}{W} = \dfrac{-(2xcos (x^2) +sin(x^2)}{sin(x^2)}dx\) Now take integral both sides to get W, then plug back to (1) to find V' Tha is V', NOT V, hence, you have to take integral again to get V, then plug back to \(y_2 = y_1 V(t) \) to get \(y_2\)

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