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Show that `y=x sin x` is a solution of the differential equation `(d^(2)y)/(Dx^(2))+y-2cosx=0`. |
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Answer» `y=x sin x`……….`(1)` Differentiate with respect to `x` `(dy)/(dx)=x*cosx+sinx`………..`(2)` Again differentiate with respect to `x` …………`(2)` Again differentiate with respect to `x` `(d^(2)y)/(dx^(2))=x(-sinx)+cosx+cosx` `=-x sin x+2cosx` `=-y +2cos x` [From eq. `(1)`] `implies (d^(2)y)/(dx^(2))+y-2cosx=0` `:. y=sinx` is a solution of the given differential equation. |
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