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

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.)

Wow first post

| Comment 1 of 15

I've never had the chance to be first before :D

No idea about the puzzle though!

Peace, Rawlyn.

Posted by Rawlyn on 2004-02-26 15:36:04

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