Question 1180404
.


Is my understanding correct, that you are unable to use your calculator ?




If you are interested to learn it, look into these Internet sources


https://www.youtube.com/watch?v=IbYCPiMfsoc


https://mathbits.com/MathBits/TISection/Trig/trigequations.htm




First link is YouTube video-lesson.


Second link is written instructions.