Solve the differential equation cos^2x (...

Solve the differential equation `cos^2x (d^2y)/dx^2=1`

A

y = log cos x + cx

B

`y = log sec c_1x + c_2`

C

`y = log sec x -c_1x+c_2`

D

None of these

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The correct Answer is:

B, C

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