perplexus.info :: Just Math : trigonometry and a triangle

Home > Just Math

trigonometry and a triangle (Posted on 2004-02-26)

Prove that in a triangle ABC,:

sin(A)sin(B)sin(C) + cos(A)cos(B) = 1

implies:

A = B = 45° and C = 90°.

See The Solution Submitted by mohan

Rating: 2.7143 (7 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)

lol

| Comment 8 of 15 |

lol i dont know what this problem is about, but it has probly been used before. It is hard to think of mew, original problems like that when there are already so many out there.

Posted by matt runchey on 2004-02-27 17:36:49

Please log in:

Login:
Password:
Remember me:

Sign up! \| Forgot password

Search:

Search body:

Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (5)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:


perplexus dot info