Math Is Fun Forum

tony123

Member

Registered: 2007-08-03

Posts: 229

acute angle

find acute angle x such that

Last edited by tony123 (2008-02-26 04:25:20)

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: acute angle

Last edited by JaneFairfax (2008-02-27 08:21:44)

JaneFairfax

Member

Registered: 2007-02-23

Posts: 6,868

Re: acute angle

Well, I didn’t find the solution the following way – but now that I’ve found the solution, it finally hit me that I could have done it the following way instead of the messy method I used.

The roots of the complex equation

are

The sum of the roots is equal to 0. QED.

tony123

Member

Registered: 2007-08-03

Posts: 229

Re: acute angle

yes jane the only solution  x=2pi/7

x  acute

but you can get the solution by multiplying by 2sinx/2

thank you

gAr

Member

Registered: 2011-01-09

Posts: 3,482

Re: acute angle

Hi tony123,

The way you wanted:

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"Believe nothing, no matter where you read it, or who said it, no matter if I have said it, unless it agrees with your own reason and your own common sense"  - Buddha?

"Data! Data! Data!" he cried impatiently. "I can't make bricks without clay."