Posted by **jenny** on Wednesday, August 24, 2011 at 1:22am.

use exact values of the sin,cos and tan of (pi/3) and (pi/6)(which I have found)and the symmetry of the graphs of sin,cos and tan to find the exact values of sin(-pi/6), cos(5pi/3) and tan (4pi/3). I know that sin -(pi/6) = -1/2 and cos (5pi/30 = 1/2 and tan 4pi/3 = root 3. Please will someone tell me what the symmetry of the graphs is and how do I plot them in excel

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