Question 513525
Please Verify, 
( (sinx) /(1+cosx) ) = ( (1-cosx) / (sinx) )). 
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starting with left side:
(sinx)/(1+cosx)
multiply both sides by (1-cosx)
sinx*(1-cosx)/(1+cosx)*(1-cosx)
sinx*(1-cosx)/1-cos^2x
sinx*(1-cosx)/sin^2x
(1-cosx)/sinx
verified: left side= right side