(adsbygoogle = window.adsbygoogle || []).push({}); [SOLVED] Math - solving equation

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

x belongs to Real numbers

2. Relevant equations

solving on paper

cos^2(x) - 4*cos(x) + (7 / 4 ) < 0

3. The attempt at a solution

no worthly attemps yet

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# Homework Help: Math - solving equation

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