2007-01-06 10:37:09 · 8 answers · asked by angel 1 in Science & Mathematics ➔ Mathematics
By substituting into the second equation you get
y=sin(90-180) which rewritten is y=sin(-90)
The sine of -90 degrees is -1 hence y=-1
2007-01-06 10:42:21 · answer #1 · answered by raf67ab 2 · 1⤊ 0⤋
x=90,calculate y=sin(x-180)
y = sin (90 -180) = sin( -90)
sin (-90) = - sin(90) = -1
2007-01-06 10:48:53 · answer #2 · answered by ironduke8159 7 · 1⤊ 0⤋
y = sin(x - 180)
y = sin(90 - 180)
y = sin(-90)
y = -1
2007-01-06 10:43:07 · answer #3 · answered by frostwizrd 2 · 1⤊ 0⤋
sin(A-B)=sin A cos B - cos A sin B; a=90, b=180
sin(90)cos(180) - cos(90)sin(180)
0-0 = 0
2007-01-06 10:50:22 · answer #4 · answered by hunneebee22 4 · 0⤊ 0⤋
y=sin(90-180)
y=sin(-90)
y=-1
2007-01-06 10:55:15 · answer #5 · answered by Anonymous · 0⤊ 0⤋
y would equal sin(-90). Which I don't believe it is possible to solve the sin of a negative number.
2007-01-06 10:49:35 · answer #6 · answered by mr_choyce87 2 · 0⤊ 0⤋
x=90
y=sin(x-180)
=sin(90-180)
=sin(-90)
=-sin(90)
=-1
2007-01-06 10:46:47 · answer #7 · answered by ArgumentativeButNotInsulting 4 · 1⤊ 0⤋
=-1
2007-01-06 10:42:15 · answer #8 · answered by Anonymous · 1⤊ 0⤋