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प्रश्न
Choose the correct alternative:
The differential equation representing the family of curves y = A cos (x + B), where A and B are parameters, is
विकल्प
`("d"^2y)/("d"x^2) - y = 0`
`("d"^2y)/("d"x^2) + y = 0`
`("d"^2y)/("d"x^2) = 0`
`("d"^2x)/("d"y^2) = 0`
उत्तर
`("d"^2y)/("d"x^2) + y = 0`
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