Hello,
Well, It seems like you want to design and develop an advanced scientific Mathematical calculator App which can help the user to resolve the equations similar to the one you have mentioned in the job description.
Please let me know if I am right about the concept or not after your answer only I will be able to share a further understanding of the job along with the relevant suggestions for the design and development of your app.
Looking forward in anticipation to your response.
Warm Regards,
umesh