Question

how do I evaluate cot of 120? Without a calculator

Answer 1

@ganeshie8

Answer 2

do you know the unit circle chart?

Answer 3

what is that?

Answer 4

its this.

http://www.google.com/imgres?imgurl=http://etc.usf.edu/clipart/43200/43215/unit-circle7_43215_lg.gif&imgrefurl=http://etc.usf.edu/clipart/galleries/617-unit-circles&h=225&w=225&tbnid=QVAM-3eg4ofZjM:&zoom=1&tbnh=186&tbnw=186&usg=__G5ez3VkOtBLFkgT88lzlRc_y2Qs=&docid=6bg0putUtYyCxM&itg=1&ved=0CIEBEMo3&ei=gu0UVKzOIuaGjALiyYD4Ag

have you seen it before?

Answer 5

no

Answer 6

2(pi) / 3?

Answer 7

well, its base on SOHCAHTOA. and the circle has a radius of 1

Answer 8

the numbers with pi are radians.

Answer 9

so pie is the radius?

Answer 10

what is the coordinate for 120?

Answer 11

(-1/2 , SQUARE ROOT 3/2 )

Answer 12

no. 1 is the radius. RADIAN is something different. it is not the same as radius

Answer 13

ok.
and to find cot, its just x/y

Answer 14

like this?

Answer 15

@nikato

Answer 16

yes. and now simplify