1.8666
.2874
-0.2958
-1.2750
Which One? And how do you calculate this this problem for future reference?
2006-12-23 07:56:55 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
For a multiple choice question, don't even reach for a calculator. The cosine is positive from -pi/2 to pi/2. Since this answer is nagative, the angle must be greater than pi/2 so it must be greater than 1.57. Only one selection fits, 1.8666.
2006-12-23 09:45:35 · answer #1 · answered by Pretzels 5 · 2⤊ 0⤋
arccos (-0.2915) = 1.8666
I used Google Calculator to evaluate this function. Just type in the expression as it is in the search area and u will get the radian value as the answer.
2006-12-23 16:03:44 · answer #2 · answered by Mechz 1 · 3⤊ 0⤋
1.8666
And the method for calculating this is:
#1: set calculator to radian mode
#2: enter cos⁻¹ (-0.2915)
Seriously, that's it.
2006-12-23 16:02:14 · answer #3 · answered by Pascal 7 · 3⤊ 0⤋
The answer is 1.8666
I did this in my calculator:
cos^-1(-0.2915)=1.8666
2006-12-23 16:12:44 · answer #4 · answered by Anonymous · 2⤊ 0⤋
1.8666
Arccos(-.2915) lies between 180 and 270
Arccos (0.2915) = 1.2747 rad (set your calculator at rad or divide the angle deg by 57.3)
The angle = pi - 1.2747 = 1.8666
2006-12-23 16:15:27 · answer #5 · answered by Sheen 4 · 1⤊ 0⤋
arccos -0.2915=1.8666
2006-12-23 21:11:34 · answer #6 · answered by mu_do_in 3 · 0⤊ 0⤋