Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

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#1 2007-08-06 11:19:13

tony123
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prove

Last edited by tony123 (2007-08-06 11:21:31)

#2 2007-08-08 09:49:53

JaneFairfax
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Re: prove

First you show that sin80 = sin40 + sin20. I have set this as a separate exercise for you to do:
http://www.mathsisfun.com/forum/viewtop … 580#p76580 big_smile



Last edited by JaneFairfax (2007-08-08 09:53:15)


Q: Who wrote the novels Mrs Dalloway and To the Lighthouse?

A: Click here for answer.

#3 2007-08-08 10:55:26

Ricky
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Re: prove

Reason #131 why I hate trig.


"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."

#4 2007-08-08 11:00:30

MathsIsFun
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Re: prove

Nice job there Jane.


"The physicists defer only to mathematicians, and the mathematicians defer only to God ..."  - Leon M. Lederman

#5 2007-08-08 12:55:06

George,Y
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Re: prove

You've been so patient Janefairfax.


X'(y-Xβ)=0

#6 2007-08-08 17:53:02

Identity
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Re: prove

Wow. That is amazing!

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