The equation for cosine is <span><span><span>cos<span>(x)</span></span>=<span>Adjacent/Hypotenuse </span></span></span>The inside trig function is <span><span>arccos<span>(<span>3/5</span>)</span></span></span>, which means <span><span><span>cos<span>(x)</span></span>=<span>3/5</span></span></span>. Comparing <span><span><span>cos<span>(x)</span></span>=<span>Adjacent/Hypotenuse</span></span></span> with <span><span><span>cos<span>(x)</span></span>=<span>3/5 </span></span></span> Find <span><span>Adjacent=3</span></span> and <span><span>Hypotenuse=5. </span></span>Then, using the Pythagorean theorem, find <span><span>Opposite=? </span></span>a² = c² - b² a² = 5² - 3² = 25 - 9 = 16 a = √16 = 4
<span><span>Adjacent=3</span></span><span><span>Opposite=4</span></span><span><span>Hypotenuse=5 </span></span><span> Plug in the value for sin(x) = opposite/hypotenuse
