Question about Texas Instruments TI-89 Calculator

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When i take the derivative or anti derivative of sinx the answer comes out to be pi*cosx/180...i dont know why it's doing that. how do i fix it???

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You're in degrees mode. Press MODE, use down-arrow to get to Angle, press right-arrow and 1 to select RADIAN, then press ENTER to save the change.

Posted on Sep 12, 2010

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2 Answers

Find the derivitive of sin(cosx)


The 9750GII doesn't have symbolic capabilities so it can't give you a symbolic answer for this. It can evaluate it numerically at any point.

The derivative of sin(cos(x) dx is cos(cos(x))-sin(x).

Oct 08, 2013 | Casio FX-9750GII Graphing Calculator

2 Answers

Derivatives


The derivative of sin(cos(x)) dx is cos(cos(x))-sin(x). Unfortunately the fx-9850GII doesn't do symbolic differentiation so you'll have to get this result some other way. I cheated and used a calculator from another manufacturer, one that does do symbolic differentiation.

Oct 08, 2013 | Casio FX9750GII Graphic Calculator

1 Answer

Use the identity tan(x/2)=sinx/1+cosx to solve for the value of tan45 degrees


tan(x/2)=sin(x)/(1+cos(x))
Setting x/2=45, means that x=90 (degrees)
But cos(90)=0 and sin(90)=1. Thus tan(45)=1/(1+0)=1.

Mar 13, 2013 | SoftMath Algebrator - Algebra Homework...

1 Answer

Differentiate (sin x)x w.r.t. x.


Nevermind, i assume it's an acronym meaning with respect to x.
so the derivative of (sinx)x is: (cosx)(x) + (sinx)(1)
Simplified: xcosx + sinx

Mar 08, 2011 | Cycling

1 Answer

SinX-cosX=4 how can this be solved?


I gues this problem has no solution because both
SinX and cosX should be between -1 and +1 so it's not possible that value of SinX - cosX should be 4

Dec 12, 2010 | ValuSoft Bible Collection (10281) for PC

1 Answer

(sin-cos)(sin+cos)


(sinX-cosX)(sinX+cosX) =(sin^2 - Cos^2X)
=Sin^2X - (1-Sin^2X)
=Sin^2X -1 + Sin^2X
=2Sin^2X -1

Zulfikar Ali
ali_zulfikar@yahoo.com
9899780221

Jan 26, 2009 | Super Tutor Trigonometry (ESDTRIG) for PC

2 Answers

Wat is the solution for sinx-cosx=2 ?


whats the appropriate unit of measure for -5 1/4in - 2 2/3 in

Aug 09, 2008 | SoftMath Algebrator - Algebra Homework...

3 Answers

Sinx+cosx=5, tanx+secx=3 then sinx=?


tanx= sinx/cosx,
secx=1/cosx
1+sinx/cosx=3
1+sinx=3cosx---------->1
cosx=5-sinx------------->2

sub 2 in 1
1+sinx=3(5-sinx)
1+sinx=15-3sinx
1+4sinx=15
4sinx=14
sinx=14/4...
this is the solution..

Jul 14, 2008 | ValuSoft Bible Collection (10281) for PC

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