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Cramer's Rule is a method that uses determinants to solve systems of equations that have the same number of equations as variables
Answer:

Step-by-step explanation:
<u>Use identities to set the equation up as a quadratic</u>

<u>Make the substitution u=cos(x) and solve the quadratic</u>
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Hence, 
Answer:
(7,9)
Step-by-step explanation: