cot = `1/tan`
sec = `1/cos`
therefore cot x sec x = `1/tan x * 1/cos x`
tan x= `sinx/cos x `
therefore `1/tan x=cosx/sin x`
`cosx/sinx*1/cosx` =`1/sinx=csc x`
therefore final answer = csc x or multiple choice d
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