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If y =a cos mx + b sin mx, then (d ^(2)y...

If `y =a cos mx + b sin mx,` then `(d ^(2)y)/(dx ^(2))=`

A

`-m^(2) y`

B

` m ^(2) y`

C

`my ^(2)`

D

`my `

Text Solution

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The correct Answer is:
A
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