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Chongqing senior high school entrance examination mathematics 20 10 finale second question process! Please.
Solution: (1) Do CD⊥OA at point D after point C.

OC = AC,∠ACO= 120,

∴∠AOC=∠OAC=30。

∵OC=AC,CD⊥OA,∴OD=DA= 1.

In Rt△ODC, the opposite side of 30 degrees is half of the hypotenuse, so oc= two thirds times the root number three.

When 0 < t