how do get the minute/seconds when using sin/cos/tan?

The standard trig functions return an angle value, not an angle!!!!

The inverse functions return an angle.

I'm assuming you want to know how to convert an angle in decimal form to DMS form.

Let me show you.  Let's suppose that we have an angle with a measure of 23.438° and we want to convert it to DMS.

First, ignore the 23.  Now multiply .438 by 60 = 26.28. The whole number part is the number of minutes.

Again, ignore the whole number part and multiply .28 by 60 = 16.8. This is the number of seconds.

So 23.438° = 23° 26' 16.8" in DMS form.

Converting back is easy......use this "formula"

Degrees  + (Minutes / 60) + (Seconds / 3600)= 23 + (26/60) + (16.8/3600)  =

23.438°........which is just what we started with!!

Hope that helps......