What is the value of sin(-240º)?
2007-09-17 13:22:42 · 4 answers · asked by inferno5757 1 in Science & Mathematics ➔ Mathematics
Since the sin function is periodic, with period 360°, sin(-240°) = sin(-240° + 360°) = sin(120°). This, by turn, is equal to sin(180° - 120°) = sin(60°) = sqrt(3)/2.
2007-09-17 13:30:15 · answer #1 · answered by jcastro 6 · 0⤊ 0⤋
sin(-240 deg) == sin (360 + -240) = sin(120 deg)
120 deg is on the second quadrant
forming a 60 deg angle with the x-axis
this makes sin(120) == sin(60) == sqrt{3}/2
2007-09-17 20:30:58 · answer #2 · answered by rommelA 2 · 0⤊ 0⤋
If you have a Windows PC you do have a calculator. Bring up the calculator and click on VIEW and select Scientific for the Sine and other functions.
TMD
2007-09-17 20:34:52 · answer #3 · answered by The Mad Doctor ™ 3 · 0⤊ 0⤋
.87?
2007-09-17 20:29:39 · answer #4 · answered by Liz 3 · 0⤊ 0⤋