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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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).

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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.

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

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...

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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

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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


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

Zulfikar Ali

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

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Wat is the solution for sinx-cosx=2 ?

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

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

tanx= sinx/cosx,

sub 2 in 1
this is the solution..

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