How can I get exact trig values on my calculator (ie. fractions of pi)?
This is a bit involved, but it does work nicely once you get the hang of it. It’s a bit questionable really whether it’s easier to do it by hand! As an example, we’ll use the Solve aplet to solve for x in the equation 2sin(x)+2=1on the domain of 0 to 2pi. NOTE: In all the explanations following, I will use ‘pi’ to represent the proper symbol found on the 3 key. In the Solve aplet, enter the equation 2*SIN(X)+2=1 in to the SYMB view. Change to PLOT SETUP and set the XRng to 0 to 2pi (using the 3 key to enter pi) and the YRng to -3.1 to 3.2. Enter an XTICK value of pi/4. Now press PLOT. Move the cross-hair close to the first solution (at about X=3.6) and then press NUM. If you now press SOLVE, the calculator will find the nearest solution of 3.665… Change to the MODES screen and set the NUMBER FORMAT to ‘Fraction 6’. Now change to the HOME view and type in X/pi. The answer is 7/6, so the required value is 7pi over 6. Basically you are removing the pi from the answer and giving the calc
This is a bit involved, but it does work nicely once you get the hang of it. It’s a bit questionable really whether it’s easier to do it by hand! As an example, we’ll use the Solve aplet to solve for x in the equation 2sin(x)+2=1on the domain of 0 to 2pi. NOTE: In all the explanations following, I will use ‘pi’ to represent the proper symbol found on the 3 key. In the Solve aplet, enter the equation 2*SIN(X)+2=1 in to the SYMB view. Change to PLOT SETUP and set the XRng to 0 to 2pi (using the 3 key to enter pi) and the YRng to -3.1 to 3.2. Enter an XTICK value of pi/4. Now press PLOT. Move the cross-hair close to the first solution (at about X=3.6) and then press NUM. If you now press SOLVE, the calculator will find the nearest solution of 3.665… Change to the MODES screen and set the NUMBER FORMAT to ‘Fraction 6’. Now change to the HOME view and type in X/pi. The answer is 7/6, so the required value is 7pi over 6. Basically you are removing the pi from the answer and giving the calc
