146 day 23
November 12, 2014
tan(0)=­8/15
15
17
15 + 8 = 289
­8
sin (0)= ­8/17
cos(0)=15/17
sin(20)=2(­8/17)(15/17)=­240/289
cos(20)=2(15/17)(15/17)­1=161/289
tan(2x)=sin(2x) = ­240
cos(2x) 161
146 day 23
November 12, 2014
146 day 23
November 12, 2014
tan(210/2)=(1­cos(210))/sin(210)
1­
= ­2 ­ sqrt(3)
146 day 23
November 12, 2014