pan> in the equation <span class="inline_math">\( \cos^{-1}\!\left( \frac{x}{A} \right) - \phi = \omega t \)</span>.<span class="intersentencespace"></span> 
</div>

<div class="miniref-problem" id="mathprob-ch1-fractions2" data-tralics-id="mathprob-ch1-fractions2" data-number="1.3"><span class="problem number">P1.3 </span> 

Solve for <span class="inline_math">\( x \)</span> in the equation <span class="inline_math">\( \frac{1}{x}=\frac{1}{a}+\frac{1}{b} \)</span>.<span class="intersentencespace"></span> 
