If the transformation z= log "tan" (x)/(...

If the transformation `z= log "tan" (x)/(2)` reduces the differential equation `(d^(2)y)/(dx^(2)) + cos x (dy)/(dx) + 4y cosec^(2) x= 0` into the form `(d^(2)y)/(dz^(2)) + ky= 0` then k is equal to

A

`-4`

B

4

C

2

D

`-2`

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