Question 307340
 This is proving a trigonemetric function. 
Verify (1+sec(-x))/(sin(-x)+tan(-x)=-csc(x)
-csc(x) = csc(-x), so
All angles are -x
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1+sec = csc*(sin + tan) = 1 + (1/sin)(sin/cos)
1+sec = 1 + 1/cos
1+sec = 1+sec