trignometry
2006-07-08 23:09:50 · 5 answers · asked by kar 1 in Education & Reference ➔ Homework Help
I assume you mean 420° - note that all trigonometric functions have a period of 360°, which means that you can add or subtract 360° without changing anything (conceptually, this is because going around the unit circle one full revolution leaves you exactly where you started). Thus, sin 420°=sin 60°, which is √3/2 exactly. If you don't know why this is, look at http://en.wikipedia.org/wiki/Special_right_triangles .
2006-07-08 23:25:18 · answer #1 · answered by Pascal 7 · 0⤊ 0⤋
you must subtract first 420 with 360..
so this will be
420 - 360 = 60
and sin 60 is equal to
square root of 3 over 2
2006-07-09 07:30:24 · answer #2 · answered by xieng xieng 1 · 0⤊ 0⤋
sin420
=sin(360+60)
=sin60
=(3^half)/2
=1.732/2
2006-07-09 06:55:03 · answer #3 · answered by pavi 3 · 0⤊ 0⤋
answer to everythin is 42
2006-07-09 06:26:39 · answer #4 · answered by shaz 1 · 0⤊ 0⤋
-0,827 rad
2006-07-09 06:14:04 · answer #5 · answered by Breno 1 · 0⤊ 0⤋