It's important to explain first what particular thing you wish to do with math apps. cuz, there are such a lot of apps with completely different facilities. Whatever, don't use "math graphing" (v 1.3). I was very hopeful but that is junk. First I tried to plot a simple method
20*log10(a hundred)
But no luck. I can consider in calculator mode however plot fails totally. I despatched for help however no response. I attempted several different choices with excessive diploma of failure. App is premature. Wait for one thing better.