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)

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

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

Nevermind, i assume it's an acronym meaning with respect to x.
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SinX-cosX=4 how can this be solved?

I gues this problem has no solution because both
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(sinX-cosX)(sinX+cosX) =(sin^2 - Cos^2X)
=Sin^2X - (1-Sin^2X)
=Sin^2X -1 + Sin^2X
=2Sin^2X -1

Zulfikar Ali

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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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