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What is the right choice for question 22) ? http://postimg.org/image/gsm19eu0b/

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What is the right choice for question 22) ?

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Posted (Answer #1)

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cot(x)`*sec(x)`

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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