Question about SoftMath Algebrator - Algebra Homework Solver (689076614429)

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Use the identity cos(2x)=2(cos(x))^2-1

cos(2x)+3=5cos(x) becomes 2(cos(x))^2-1+3=5cos(x)

Arrange a bit: 2(cos(x))^2-5cos(x)+2=0

Get rid of the 2-factor

(cos(x))^2-(5/2) cos(x)+1=0

This is a quadratic equation for the unknown U=cos(x)

U^2-(5/2)U+1=0

Solve it by factoring or with the quadratic equation formula. The solutions are** U=2 or U=1/2.**

Since U=cos(x), the root U=cox(x)=2 must be rejected.

What is left is cos(x)=(1/2). The solutions are x=60 or x=-60 plus or minus 360 degrees.

Posted on Jul 26, 2014

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Posted on Jan 02, 2017

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May 02, 2014 | Office Equipment & Supplies

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Dec 22, 2013 | Video Game Consoles & Games

There are an infinite number of solutions for this. Among them are 0, pi, 2pi, 3pi, and 4pi (see a pattern?).

Jun 12, 2013 | Computers & Internet

To find solution for your problem you have to type in Y editor **y1=cos(2x)**

Then graphing function. See captured image

Mar 15, 2012 | Texas Instruments TI-84 Plus Calculator

this is the exact model and drivers that yu need the paqe is in japanese but you can use bing to translate if necessary

http://121ware.com/psp/PA121/NECS_SUPPORT_SITE/CRM/s/WEBLIB_NECS_DID.PRODUCT_ID.FieldFormula.IScript_VDown_Id_Mod?prodId=PC-LR7008E

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Jun 01, 2011 | NEC LaVie RX Notebook

the solution you got is correct it is

cos X =2 and cos X =1/2

but we know maximum value of cosX is 1.so we discard the solution cos X =2

so only solution is cos X=1/2

and X = 60 degrees

hope you r satisfied.please rate the solution high.thank you

cos X =2 and cos X =1/2

but we know maximum value of cosX is 1.so we discard the solution cos X =2

so only solution is cos X=1/2

and X = 60 degrees

hope you r satisfied.please rate the solution high.thank you

Apr 17, 2010 | SoftMath Algebrator - Algebra Homework...

DelVar x , I think on your calculator x might be part of a list so, delete it at the main folder should work. If you hit NewProb before you start it will delete all single varibles for you so, you won't have conflicts using them. You have everything correct, its just your ti memory that missed you up.

If for some reason this doesn't work, let know by adding a comment and I'll quickly help you so, you can get on and won't have hang ups.

If for some reason this doesn't work, let know by adding a comment and I'll quickly help you so, you can get on and won't have hang ups.

Sep 25, 2009 | Texas Instruments TI-89 Calculator

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