# How do you solve #4cos^2x-1=0#?

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Steve M
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Oct 21, 2016

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This is a trivial quadratic equation in

In order to solve this you need to be familiar with the graphs of the trig functions along with common values:

The range of soutions is not specified in the question, so lets assume we want a solutio in radians, and

Consider,

Consider,

So the solutions are:

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