A anaseer New member Joined Feb 8, 2011 Messages 12 Feb 19, 2011 #1 I need help to solve this problem calculate sin 570 without using calculator I know 360= 2 pi and 180 = pi I set (570 - 360 )=210 sin 210 I dont the value of 210 How do I find the value on 210?
I need help to solve this problem calculate sin 570 without using calculator I know 360= 2 pi and 180 = pi I set (570 - 360 )=210 sin 210 I dont the value of 210 How do I find the value on 210?
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Feb 19, 2011 #2 "Reference Angle" 210 = 180 + 30
A anaseer New member Joined Feb 8, 2011 Messages 12 Feb 20, 2011 #3 210 = pi + pi/6 = 7pi/6 is that right or do i have to add 2pi also
A Aladdin Full Member Joined Mar 27, 2009 Messages 551 Feb 20, 2011 #4 anaseer said: 210 = pi + pi/6 = 7pi/6 is that right or do i have to add 2pi also Click to expand... What's, sin(pi +alpha) ~
anaseer said: 210 = pi + pi/6 = 7pi/6 is that right or do i have to add 2pi also Click to expand... What's, sin(pi +alpha) ~
A anaseer New member Joined Feb 8, 2011 Messages 12 Feb 20, 2011 #5 I check all my book but I couldn't find What's, sin(pi +alpha) ~
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Feb 20, 2011 #6 Did you look up "Reference Angle"? What sin(30º)?
