# Parse equation and simple function

**URL:** <https://cl.desmos.com/t/parse-equation-and-simple-function/2956>\
**Category:** Questions\
**Created:** [March 20, 2021, 12:09am UTC](https://cl.desmos.com/t/parse-equation-and-simple-function/2956 "2021-03-20T00:09:35Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Julia\_Smith](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/julia_smith/32/281_2.png) [@Julia\_Smith](https://cl.desmos.com/u/Julia_Smith)\
**Post date:** [March 20, 2021, 12:09am UTC](https://cl.desmos.com/t/parse-equation-and-simple-function/2956/1 "2021-03-20T00:09:35Z")

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Hi! The simple function and equations always give me issues. And it’s probably something ridiculous and small that I am overlooking but I cannot get slide 12 input5 to give the correct feedback when I enter the answer. They should be entering xtan(15)=43

> **[Trigonometric Functions • Activity Builder by Desmos](https://teacher.desmos.com/activitybuilder/custom/604d678ef091860babc9f850)**
>
> by Julia Smith

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<div class="post-metadata">

**Author:** ![Daniel\_Grubbs](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/daniel_grubbs/32/719_2.png) [@Daniel\_Grubbs](https://cl.desmos.com/u/Daniel_Grubbs)\
**Post date:** [March 20, 2021, 12:37am UTC](https://cl.desmos.com/t/parse-equation-and-simple-function/2956/2 "2021-03-20T00:37:43Z")

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CL uses radians, so it’s probably not evaluating correctly for that reason. If you use a graph (and set it to degrees), you can send the lhs into the graph as a function:

```auto
hidden: true
function(`f`): input5.script.lhs

```

and evaluate in [the graph](https://www.desmos.com/calculator/enndzpnam7).  
In your input use the variable, C\_{heck}, from the graph instead of your inequalities:

```auto
correct= yourGraphName.number(`C_{heck}`)=0 and eq.rhs=`43`

```

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<div class="post-metadata">

**Author:** ![Julia\_Smith](https://yyz1.discourse-cdn.com/flex031/user_avatar/cl.desmos.com/julia_smith/32/281_2.png) [@Julia\_Smith](https://cl.desmos.com/u/Julia_Smith)\
**Post date:** [March 20, 2021, 2:45am UTC](https://cl.desmos.com/t/parse-equation-and-simple-function/2956/3 "2021-03-20T02:45:14Z")

</div>

Thank you! That worked!