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Simple trigonometric simplification

  • #1
Krushnaraj Pandya
Gold Member
697
71

Homework Statement


Show that sec(x-(pi/2))+tan(x-(pi/2))=tan((x/2)+pi/12))

The Attempt at a Solution


I applied all sorts of half angle formulas to convert it in terms of tan, I got LHS as (tan((x/2)-(pi/6))+1)^2/1-tan^2(x/2-(pi/6)) but I'm sure there must be a simple easy method to get the RHS (PS this is part of a bigger problem, I got the answer as LHS, I need to equate it to RHS for my answer to be correct
 

Answers and Replies

  • #2
Ray Vickson
Science Advisor
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Homework Statement


Show that sec(x-(pi/2))+tan(x-(pi/2))=tan((x/2)+pi/12))

The Attempt at a Solution


I applied all sorts of half angle formulas to convert it in terms of tan, I got LHS as (tan((x/2)-(pi/6))+1)^2/1-tan^2(x/2-(pi/6)) but I'm sure there must be a simple easy method to get the RHS (PS this is part of a bigger problem, I got the answer as LHS, I need to equate it to RHS for my answer to be correct
If you plot both sides you will see that the equation you wrote is not correct.

Here is a piece of advice: always try plotting first, before attempting to prove an unfamiliar result; sometimes you can save yourself hours of useless work by doing that.
 
  • #3
Krushnaraj Pandya
Gold Member
697
71
If you plot both sides you will see that the equation you wrote is not correct.

Here is a piece of advice: always try plotting first, before attempting to prove an unfamiliar result; sometimes you can save yourself hours of useless work by doing that.
right, got it. I'll need to post the entire question then
 

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