Question 1130896
Verify the identity, showing your steps 

(tanx+cosx)/(sinx) = secx+cotx
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Multiply by sin
tan + cos = sin/cos + cos
tan + cos = tan + cos
QED
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It's not a Master's thesis.
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I'm still waiting for an example of working only 1 side makes a difference.
Been waiting over 50 years.