Question about Texas Instruments TI-30XA Calculator

# TI-30xa Calculator Reciprocal Key

Does this calulator have a reciprocal key?

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• Anonymous Mar 17, 2014

help

• Anonymous Mar 24, 2014

how to set significant digits

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## 1 Answer

### Anonymous

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It does. For instance, to get the reciprocal of 4, enter the following sequence: 4 [1/x] (this last key to be found third row down, second black key in). The decimal 0.25 will appear as the result. Convert this, if you want, to the fraction 1/4 by pressing the yellow function key [2nd], then {F<>D] located bottom, far left. Hope that's what you wanted!

Posted on Oct 04, 2007

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## Related Questions:

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### How to do reciprocal identities with the TI-30XA Calculator

Your question is not clear. To calculate the reciprocal of a number on display use the x^-1 or 1/x key, or just enter 1/ number.
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### How do I find the reciprocal of a number

Enter the number and press the = sign.
With the number displayed, press the power key (marked as [X^y], [Y^x] or [^]) followed by exponent -1.
OR while the number is stored in Ans memory, enter 1 / Ans.
Some calculators have a special key for the reciprocal. It is marked as [x^-1]. By pressing the reciprocal key while number is displayed, you calculate its reciprocal.
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### Calculator reciprocal

Use the 1/x key or the general power key x^-1.
By hand 0.6=3/5
The reciprocal of 3/5 is 5/3
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### Reciprocal key

It's the second function of the "2" key, marked "x-superscript-negative-one".
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### How do i do reciprocals on the TI-84

There is a key on the left column of keys, below the MATH key and above the x^2 key. It is marked with an x raised to power of -1.
It computes the reciprocal of the number displayed.
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### Where is the consecant key

There isn't a cosecant key. Use the relationship
csc(x) = 1 / sin(x)

Compute the sine and take its reciprocal.
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### Find csc(-330°) to the nearest hundredth

The cosecant function does not have a specific key on any calculator because it can be easily calculated as the reciprocal of sine.
Thus csc(-330°)=1/sin(-330°)=2
sin(-330°)=sin(360°-330°)=sin(30°)=0.5
csc(-330°)=1/0.5=2
If you do not want to be bothered with these facts, just calculate the sine of -330° and take the reciprocal of the result using the [x^-1] key. For the minus sign before 330, use the change sign key (-). Close the right parenthesis.

[SIN] [(-)] 330 [)] [x^-1]

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