8:02 sine is positive in the 2nd quadrant but the angle is negative .I understand that negative angles start anti clockwise (the 1st angle we found) and that sine is negative in 4th quadrant so we get first angle in 4th quadrant but I don't get why the second angle is in the 2nd quadrant and not the third as sin is negative in 3rd and 4th? if it's that way than we'd do 180+first angle so final answers would differ.
I drew the quadrant diagram incorrectly... the line I drew should be in the 3rd quadrant... but the value I got was correct because I calculated pi - (- 0.4...) but I did the correct calculation... check the comments below and I've addressed this issue with another viewer
The calculator gives the 1st answer .. 180 minus that answer for sine is the next main angle ... then after that all other angles are repeated every 360 degrees... at the time stamp you mentioned I did subtract the 1st answer from 180 well pi. It was after that that I used the top main angles to generate other solutions using the property of the sine curve having a period of 360 degrees or 2 pi. I did notice however that my quadrant diagram was slightly wrong .. the other line should have been in quadrant 3 ....although it didnt affect the calculations.
@@MrHassaansMathsChannel sir after you got -0.4277, and 3.5213, why didnt you add 2pi to 3.5213, like you did for -0.4277, since that value was within range as well? Is it because they have asked only the first two times ?
