What is the exact value of cos 30° ?
enter your answer, as a simplified fraction, in the box.

An equilateral triangle has all angles measuring  60 degrees and all three sides are equal.  For convenience, we choose each side to be length 2.  When you bisect an angle, you get 30 degrees and the side opposite is 1/2 of 2, which gives you 1.  Using that right triangle, you get exact answers for sine of 30°, and sin 60° which are 1/2 and the square root of 3 over 2 respectively.

1. 8 or -82. 14 or -143. -11, -3, 0, 7, 10