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## Homework Statement

Im supposed to calculate the value of x for

20*log

_{10}([itex]\frac{\sqrt{x^2 +1}}{cos(x)}[/itex]) = 3

## The Attempt at a Solution

I start off by dividing by 20 on both sides so I just have the expression with log.. and my idea henceforth is to take the inverse of cosine to get rid of cos(x), and square the square root to cancel out.. but the logarithm part has me stuck.. and im not sure how to get rid of/move it.. ive thought about multiplying with its inverse, but that has not gotten me any results.. any tips?

## Homework Statement

## Homework Equations

## The Attempt at a Solution

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