of cos 5pi/6
what do they mean by value in simplest radical form?
2007-07-02 09:42:06 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
wheres everyone getting the 3/2 from?
2007-07-02 09:48:38 · update #1
cos 5π/6 is cos π/6 in the 2nd quadrant. in the 2nd quadrant, cos is negative so
cos 5π/6=-cos π/6=-½√3
2007-07-02 09:59:39 · answer #1 · answered by yupchagee 7 · 0⤊ 0⤋
-(root3)/2
simplest radical form is a form with
* a 'rational' denominator (ie the bottom of the fraction is a whole number not a root)
* all common factors are cancelled (ie 6/8=3/4)
* all surds cancelled down too (ie root16=4, root 50=5root2)
2007-07-02 09:49:23 · answer #2 · answered by DAN H 3 · 0⤊ 0⤋
cos 5pi/6 = cos 150 degrees
So reference angle = 30 degrees
So cos 5pi/6 = -sqrt(3)/2
2007-07-02 09:45:40 · answer #3 · answered by ironduke8159 7 · 0⤊ 1⤋
-sqrt(3)/2
Simplest radical form means radicals that cannot be reduced. sqrt(32) can be reduced (sqrt(32) = sqrt(16)sqrt(2) = 4sqrt(2)), so it is not in simplest radical form.
2007-07-02 09:45:45 · answer #4 · answered by yeeeehaw 5 · 0⤊ 0⤋
-[sqrt(3)]/2
2007-07-02 09:46:37 · answer #5 · answered by grompfet 5 · 0⤊ 0⤋