Solving trig equation with TI Ispire CX

[Sunwoo Bae]

Homework Statement

solve xsin(x)-cos(x)=0 on interval (0,4) using the calculator

Homework Equations

xsin(x)-cos(x)=0

The Attempt at a Solution

I have tried working the problem out through first pressing menu- 3 (algebra)- 1 (solve)- inserting the equation- inserting the interval.
However, when I press the enter button, I get this equation instead of solid solution(s).
Below is my work on the graphing calculator.

 

[SammyS]

Homework Statement

solve xsin(x)-cos(x)=0 on interval (0,4) using the calculator

Homework Equations

xsin(x)-cos(x)=0

The Attempt at a Solution

I have tried working the problem out through first pressing menu- 3 (algebra)- 1 (solve)- inserting the equation- inserting the interval.
However, when I press the enter button, I get this equation instead of solid solution(s).
Below is my work on the graphing calculator.
View attachment 218028

Can't you simply graph that ?

 

[ComplexVar89]

Homework Statement

solve xsin(x)-cos(x)=0 on interval (0,4) using the calculator

Homework Equations

xsin(x)-cos(x)=0

The Attempt at a Solution

I have tried working the problem out through first pressing menu- 3 (algebra)- 1 (solve)- inserting the equation- inserting the interval.
However, when I press the enter button, I get this equation instead of solid solution(s).
Below is my work on the graphing calculator.
View attachment 218028

You're missing a couple of steps. Here's a quick tutorial on how to do that exact kind of problem analytically (as opposed to graphically) on the N-Spire.

 

[Sunwoo Bae]

You're missing a couple of steps. Here's a quick tutorial on how to do that exact kind of problem analytically (as opposed to graphically) on the N-Spire.

I tried the exact steps, and the solution turns out the same way.

I don't know why, but it works on ti 84

 

[Sunwoo Bae]

Can't you simply graph that ?

yes but i want to know how to do it without graphing it!

 

[SammyS]

yes but i want to know how to do it without graphing it!

It looks like you have $\ xsin(x)\$ rather than $\ x\cdot\sin(x) \$.

So it's not treating $\ sin\$ as a function.

 

[Sunwoo Bae]

It looks like you have $\ xsin(x)\$ rather than $\ x\cdot\sin(x) \$.

So it's not treating $\ sin\$ as a function.

thanks it worked!