Question about Texas Instruments TI-81 Calculator

Use 202.5*cos(63.6) instead. since it is the same angle it will be the same result.

Posted on Feb 15, 2008

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Posted on Jan 02, 2017

You enter a command. It is like an English sentence with a syntax (correct structure). If the structure of the command is wrong, you have a syntax error. You could use a minus - sign, instead of a change sign (-) that constitutes a syntax error.

May 27, 2014 | Texas Instruments TI-84 Plus Silver...

The order in which you are entering numbers and operations is not correct. For example, if you enter 5++2 most calculators will flag this as a syntax error.

On some calculators you calculate square roots as follows: 25 [SQRT]= gives 5. That is the correct syntax for this type of calculators.

For the newer ones you press the SQRT key and see displayed the square root symbol followed by a left parenthesis. You enter the number, close the right parenthesis, then =. If you do not respect the order you get a syntax error.

I cannot say more because I have no idea what you were trying to do, and more importantly, I do not know the make and model of the calculator.

On some calculators you calculate square roots as follows: 25 [SQRT]= gives 5. That is the correct syntax for this type of calculators.

For the newer ones you press the SQRT key and see displayed the square root symbol followed by a left parenthesis. You enter the number, close the right parenthesis, then =. If you do not respect the order you get a syntax error.

I cannot say more because I have no idea what you were trying to do, and more importantly, I do not know the make and model of the calculator.

Oct 28, 2013 | Office Equipment & Supplies

Try entering it as SIN pi / 6 ) =

Jul 13, 2012 | Texas Instruments TI-30 XIIS Calculator

I believe you are using the wrong syntax for the commands.

diff ( function, variable) Example: diff (sin(x^2), x) sgould give you 2.x.cos(x^2)

expand( will expand an expression that has parentheses: expand( (a+b)^2) will give a^2+2a.b+b^2

Integrate $

$ ( tan^-1(x), x) willl give x.tan^-1(x) -(1/2) ln ('x^2+1')

Check the syntax of a command before using it. You will find the list of all comands and their syntax in the reference manual.

diff ( function, variable) Example: diff (sin(x^2), x) sgould give you 2.x.cos(x^2)

expand( will expand an expression that has parentheses: expand( (a+b)^2) will give a^2+2a.b+b^2

Integrate $

$ ( tan^-1(x), x) willl give x.tan^-1(x) -(1/2) ln ('x^2+1')

Check the syntax of a command before using it. You will find the list of all comands and their syntax in the reference manual.

Aug 22, 2011 | Casio ClassPad 300 Calculator

The "normal" way is an anomaly in mathematical notation.

Think of the square of sine of x. It's normally written as sin^2(x) when it actually means (sin(x))^2. Enter the powers of trig functions as in the second form of the previous sentence, and you should have no problems.

If you still have problems, please feel free to respond to this post and give an example.

Think of the square of sine of x. It's normally written as sin^2(x) when it actually means (sin(x))^2. Enter the powers of trig functions as in the second form of the previous sentence, and you should have no problems.

If you still have problems, please feel free to respond to this post and give an example.

Jul 10, 2011 | Casio FX9750GII Graphic Calculator

If you want to correct the error you will have to disclose what you were trying to calculate.

Anyway, each command has to be written in a specific way ( a specific sequence of symbols) to be understood by the calculator.

Foe example, if the command is sin(X) you cannot write it as sin() X or X sin. You must respect the way a command is to be entered, otherwise you get rubbish or a SYNTAX ERROR message.

Usually the calculator will ask you GO TO or QUIT. If you choose GO TO the cursor will jump to the place where the error occurred and you may be able to correct the syntax.

Anyway, each command has to be written in a specific way ( a specific sequence of symbols) to be understood by the calculator.

Foe example, if the command is sin(X) you cannot write it as sin() X or X sin. You must respect the way a command is to be entered, otherwise you get rubbish or a SYNTAX ERROR message.

Usually the calculator will ask you GO TO or QUIT. If you choose GO TO the cursor will jump to the place where the error occurred and you may be able to correct the syntax.

Apr 14, 2011 | Texas Instruments TI-84 Plus Calculator

Try 4 x cos 7 5 . 8 =

The fx-300MS is a more advanced calculator than what the book is describing. It evaluates cosine(x) as cos x rather than x, cos.

The fx-300MS is a more advanced calculator than what the book is describing. It evaluates cosine(x) as cos x rather than x, cos.

Nov 02, 2010 | Casio FX-300MS Calculator

I am sorry but a scientific problem does not appear to be a valid error message. If you get unexpected results or syntax errors when trying to use the trigonometric functions (sin, cos, tan) it can be due to one of two things.

- Unexpected values: The angle unit (DEGree, RADian, GRADs) is not set to the one your problem requires. The default angle unit is RAD but the problems that students have to solve are usually cast in degrees. To correct the situation, change the unit to degree.
- The syntax is incorrect: the order in the key sequence is not the right one. If you press [SIN] the calculator displays sin(. Note the parenthesis. It is a sure indicator that the angle must be entered after the function. After you enter the value of the angle you may enter the closing parenthesis. My recommendation is to always close the parenthesis.

Jun 22, 2010 | Casio fx-300ES Calculator

Hello,

The calculator will stop screaming out SYNTAX ERROR, when you stop ordering it to do things the wrong way.

Take a look at the manual.

For certain calculations you enter the number first and then press the function key.

For others, you press the function key then the number.

If an expression contains a left parenthesis, it must also have a closing right parenthesis.

It you want to enter negative 5, you use the change sign (-) not the regular MINUS sign.

These are exemples of instances where you get a syntax error. For every new type of calculation you have to perform, read the exemple in the manual to find out which must be entered first: the number or the function.

Hope it helps.

The calculator will stop screaming out SYNTAX ERROR, when you stop ordering it to do things the wrong way.

Take a look at the manual.

For certain calculations you enter the number first and then press the function key.

For others, you press the function key then the number.

If an expression contains a left parenthesis, it must also have a closing right parenthesis.

It you want to enter negative 5, you use the change sign (-) not the regular MINUS sign.

These are exemples of instances where you get a syntax error. For every new type of calculation you have to perform, read the exemple in the manual to find out which must be entered first: the number or the function.

Hope it helps.

Sep 30, 2009 | Texas Instruments TI-30XA Calculator

go to:

mode

select DEGREE rather than RADIAN three lines down.

mode

select DEGREE rather than RADIAN three lines down.

Aug 20, 2008 | Texas Instruments TI-84 Plus Silver...

Sep 02, 2013 | Texas Instruments TI-81 Calculator

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