
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
**p1.** While computing  $7 - 2002 \cdot x$ , John accidentally evaluates from left to right  $((7 - 2002)  \cdot x)$  instead of correctly using order of operations  $(7 - (2002  \cdot x))$ . If he gets the correct answer anyway, what is  $x$ ?**p2.** Given that  $$ x^2 + y^2 + z^2 = 6 $$    $$  \left( \frac{x}{y} + \frac{y}{x} \right)^2 + \left( \frac{y}{z} + \frac{z}{y} \right)^2 + \left( \frac{z}{x} + \frac{x}{z} \right)^2 = 16.5, $$  what is  $\frac{1}{x^2} + \frac{1}{y^2} + \frac{1}{z^2}$  ?**p3.** Evaluate  $$ \frac{tan \frac{\pi}{4}}{4}+\frac{tan \frac{3\pi}{4}}{8}+\frac{tan \frac{5\pi}{4}}{16}+\frac{tan \frac{7\pi}{4}}{32}+ ... $$  **p4.** Note that  $2002 = 22 \cdot 91$ , and so  $2002$  is a multiple of the number obtained by removing its middle  $2$  digits. Generalizing this, how many  $4$ -digit palindromes,  $abba$ , are divisible by the  $2$ -digit palindrome,  $aa$ ?**p5.** Let  $ABCDE$  be a pyramid such that  $BCDE$  is a square with side length  $2$ , and  $A$  is  $2$  units above the center of  $BCDE$ . If  $F$  is the midpoint of  $\overline{DE}$  and  $G$  is the midpoint of  $\overline{AC}$ , what is the length of  $\overline{DE}$ ?**p6.** Suppose  $a_1, a_2,..., a_{100}$  are real numbers with the property that   $$ i(a_1 + a_2 +... + a_i) = 1 + (a_{i+1} + a_{i+2} + ... + a_{100}) $$   for all  $i$ . Compute  $a_{10}$ .**p7.** A bug is sitting on one corner of a  $3' \times 4' \times 5'$  block of wood. What is the minimum distance nit needs to travel along the block’s surface to reach the opposite corner?**p8.** In the number game, a pair of positive integers  $(n,m)$  is written on a blackboard. Two players then take turns doing the following:
1. If  $n \ge m$ , the player chooses a positive integer  $c$  such that  $n - cm \ge 0$ , and replaces  $(n,m)$  with  $(n - cm,m)$ .
2. If  $m > n$ , the player chooses a positive integer  $c$  such that  $m - cn \ge 0$ , and replaces  $(n,m)$  with  $(n,m - cn)$ .
If  $m$  or  $n$  ever become  $0$ , the game ends, and the last player to have moved is declared the winner. If  $(n,m)$  are originally  $(20021000, 2002)$ , what choices of  $c$  are winning moves for the first player?


PS. You had better use hide for answers. Collected [here](https://artofproblemsolving.com/community/c5h2760506p24143309).

Present the answer in LaTex format: \boxed{Your answer}
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