### VI. Menu Keys

B. F2:Algebra

This toolbar menu contains several commonly used algebraic functions. This menu is also available from the MATH menu. You may need to
clear the value of any variable that you are going to use unless you need for the variable to have a particular value during the execution of the process.

Not all options are given in the entry format. Options that are used frequently will be included, but others are omitted from the table. For a complete format listing, you can check the TI-89 manual. They can be found in the manual.

 Menu Item & Entry Format Description Example Example 1:solve solve(equation, var) This solves an expression for a specific variable. It returns only real solutions. More examples are at II. Basic Calculations, E. 2:factor factor(expression1) This will factor an expression with respect to all variables or only a specified variable. 3:expand expand(expression1) This will expand an expression with respect to all variables or only a specified variable. 4:zeros zeros(expression, var) This will determine the value(s) of a specified variable that will make an expression equal to zero. 5:approx approx(expression) This will evaluate an expression using floating-point arithmetic, where possible. Equivalent to APPROXIMATE mode. 6:comDenom comDenom(expression) This will calculate a common denominator for all the terms in an expression and changes the expression into a reduced fraction. 7:propFrac propFrac(expression, var) This will return an expression as a proper expression. 8:nSolve nSolve(equation,varOrGuess) Calculates one solution for an equation as a floating-point number. You can use the "with" operator to constrain the search to a particular interval, or you can indicate a value close to a particular solution. 9:Trig 1:tExpand tExpand(expression) This will expand a trig expression with angle sums and multiple angles. This is useful when working with trigonometric identities. 9:Trig 2:tCollect tCollect(expression) This will collect the products of integer powers of trig functions into angle sums and multiple angles. This is the opposite of tExpand. A:Complex 1:cSolve cSolve(equation, var) These are just like solve, factor, and zeros, but they will also compute complex results. A:Complex 2:cFactor cFactor(expression1) A:Complex 3:cZeros cZeros(expression, var) B:Extract 1:getNum getNum(expression) Applies the comDenom operation and returns the resulting numerator. B:Extract 2:getDenom getDenom(expression) Applies the comDenom operation and returns the resulting denominator. B:Extract 3:left left(equation) This returns the left-hand side of an equation or inequality. B:Extract 3:right right(equation) This returns the right-hand side of an equation or inequality.

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