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