Application to ordinary linear differential equations and engineering problems

Which of the following is a differential equation
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If y=sec2x+3, then which of the following is true
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If dy/dx=2x+3, then which of the following cannot be true:
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Which of the following is true
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What are the order and the degree of the differential equation d2y/dx2+y.(dy/dx)3=4
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If y=x3, then (dy/dx)2+d2y/dx2 equals
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