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A student was asked to prove the trigonometric identity tan1/2x + cot1/2x = 2cscx. Which of the following could be the first step in proving the identity?I. 1-cosx/sinx + 1-cosx/sinx = 2cscxII. 1+cosx/sinx + sinx/1-cosx = 2cscxIII. sinx/ 1+cosx + 1+cosx/sinx = 2cscx
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