how do i ,prove: 1/(sec x-1) + 1/(sec x-1)= 2cotx cscx

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1. how do i ,prove: 1/(sec x-1) + 1/(sec x-1)= 2cotx cscx
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3. find the derivative ofy=2cotx+sec3x+cscX find d^2/dx^2 for 1+y=x+xy
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