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# where k 0 is a constant. It is stated in the question that use the substitution t = sinx to solve the linear homog. dif. eq. . Can you help me

where k > 0 is a constant.

It is stated in the question that use the substitution t = sinx to solve the linear homog. dif. eq. .

Can you help me dealing with this question? I could not make it logical to substitute it with sinx