to determine the value of tangent of 7 times pi over 12, which identity could be used? the quantity 1 plus cosine of 7 times pi over 6 end quantity over sine of 7 times pi over 6 sine of 7 times pi over 6 over the quantity 1 plus cosine of 7 times pi over 6 end quantity radical of the quantity 1 minus cosine of 7 times pi over 6 over the quantity 1 plus cosine of 7 times pi over 6 end quantity i only ii and iii only i and iii only i, ii, and iii