Which of the following statements is true? O Undetermined coefficients can be used to solve the equation ("+(3-(1)= cos(1) Variation of parameters can not be used to solve the equation cos(t) cos(t) "+ cos(6) V cos(1)=tan(t). = 1² cos(t) tan(t). O Variation of parameters can be used to solve the equation ()+(1) cos(t) Y =tan(t). O The equation [3/" + con(t)/(=tan(t) is not linear, therefore it cannot be solve. cos(t)

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