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**1. The problem statement, all variables and given/known data**

show that 1-t^2/2 <=cos(t) <=1 for 0<=t<=1

**2. Relevant equations**

Trigonometry knowledge

**3. The attempt at a solution**

I don't know how to relate t with cos(t), and I also try to find out cos(1), but there is no result, so how can I start with this problem.