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June 11th, 2010, 08:01 PM  #1 
Newbie Joined: Jun 2010 Posts: 5 Thanks: 0  Proving Trigonometric Identities
Hi everyone. Just wondering if anyone can solve these trigonometric questions. Q1: (cos^2 theta)/(1 + sin theta)= 1  sin theta Q2: cosec^2 theta + sec^2 theta=(tan theta + cos^2 theta) Thanks 
June 11th, 2010, 08:48 PM  #2 
Member Joined: Jun 2010 Posts: 35 Thanks: 0  Re: Proving Trigonometric Identities
1) In the norminator there is and cancel so there is the first identity. 
June 12th, 2010, 06:25 AM  #3 
Global Moderator Joined: Dec 2006 Posts: 20,927 Thanks: 2205 
Q1: As above, cos²?/(1 + sin ?) = 1  sin(?), but only when sin ? ? 1. Q2: Not an identity. 
June 12th, 2010, 06:38 AM  #4  
Math Team Joined: Dec 2006 From: Lexington, MA Posts: 3,267 Thanks: 408  Re: Proving Trigonometric Identities Hello, muito_bossa! You said "solve these questions" . . . ?? [color=beige]. . [/color]We answer questions. [color=beige]. . [/color]We solve equations. Did you mean "Prove the identities" ? Quote: Quote: This is not an identity . . .  
June 12th, 2010, 03:16 PM  #5 
Newbie Joined: Jun 2010 Posts: 5 Thanks: 0  Re: Proving Trigonometric Identities
Thanks for the help. In regards to Q2 I think that it might be an error from the textbook as I've pretty much tried everything but to no avail.


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