2007-06-17 19:58:47 · 8 answers · asked by Del Sol 3 in Science & Mathematics ➔ Mathematics
Connie P, you're kidding, right? =]
2007-06-17 20:58:07 · update #1
Besides using an advanced scientific calculator, there are many ways to do this depending on how much math you know.
If you are aware of the trig identities:
sin(x) = -sin(-x)
sin(180-x)=sin(x)
Then combined you get that sin(-135) = -sin(135) = -sin(180-135) = -sin(45)
As you should know, sin(45) is just sqrt(2)/2,
so -sin(45) is
-sqrt(2)/2
which will be your exact answer.
2007-06-17 20:06:30 · answer #1 · answered by Hi 1 · 0⤊ 0⤋
-135° = 225° (3rd quadrant)
sin(- 135°) = sin(225°) = - sin 45° = - 1 / √2
2007-06-18 04:54:24 · answer #2 · answered by Como 7 · 0⤊ 0⤋
sin (-135) = sin (-45) and the angle locate at 180 ~ 270.
= - sin (45) = - 1 / (2^1/2) = -0.7071
(2^1/2) = surd 2
2007-06-17 22:25:35 · answer #3 · answered by cllau74 4 · 0⤊ 0⤋
sin(-135) = - sin(135)
sin (135) = sin(90 + 45) = cos (45) = 1/sqrt(2)
sin(-135) = -1/sqrt(2)
2007-06-17 20:13:16 · answer #4 · answered by Anonymous · 0⤊ 0⤋
use a reference angle of 45 degrees. find out what quadrant -135 is. then measure the angle going the other way so that its a positive number and theres your answer
2007-06-17 20:06:37 · answer #5 · answered by Anonymous · 0⤊ 0⤋
sin (-135) =-sin(135) =-sin(180-135) =-sin(45) =1/sqrt2;
2007-06-17 20:09:50 · answer #6 · answered by Anonymous · 0⤊ 0⤋
sin has no value except to send anyone to an eternity in hell & of suffering!
The exact value of Jesus Christ the one & only begotten son of GOD is Eternal life to be spent in Heaven orship & praising Jesus Christ
2007-06-17 20:07:37 · answer #7 · answered by Connie P 2 · 0⤊ 2⤋
-0.707106781.......
2007-06-17 20:06:35 · answer #8 · answered by jurassicko 4 · 0⤊ 0⤋