2002 AMC 12P Problems/Problem 25
Problem
Let and be real numbers such that and Find
Solution
Suppose we substitute and . Sum to product gives us
Dividing these equations tells us that , so for an integer . Note that , so , so our answer is .
Solution 2 (doesn't work but gives the right answer)
Given We multiply both sides of the syetem, , then we get . i.e. .
We must get the sum of the first part of the equation, then we calculate , we will get as and .
So
Comment: This problem is pretty much identical to 2007 AMC 12A Problem 17 except with different numbers.
Note: This solution is wrong since equation 1 square plus equation 2 squared gives sin a sin b and cos a cos b.
See also
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