Tolong dibantu kak :)

<p>Jawaban&nbsp;<strong> &nbsp;3</strong></p><p>&nbsp;</p><p><strong>Pembahasan :</strong></p><p>lim x—&gt;2 &nbsp;[cos (2x - 4) - cos (4x - 8)]/(x³ - 4x² + 4x)</p><p>= lim x—&gt;2 &nbsp;[cos 2(x - 2) - cos 4(x - 2)]/(x(x²- 4x + 4))&nbsp;</p><p>&nbsp;</p><ul><li>Gunakan identitas pengurangan cos dua buah sudut: cos A - cos B = -2 sin ½(A+B). sin ½(A-B)</li></ul><p>&nbsp;</p><p>= lim x—&gt;2 &nbsp;[-2 sin 3(x - 2). sin -(x - 2)]/(x(x-2)(x - 2))&nbsp;</p><p>= lim x—&gt;2 &nbsp;(2 sin 3(x - 2). sin (x - 2))/(x(x-2)(x - 2))&nbsp;</p><p>= lim x—&gt;2 &nbsp;{2 sin 3(x - 2)}/(x - 2) . {sin (x - 2)}/(x-2). 1/x</p><p>= 2. 3. 1. 1/2</p><p>= 3&nbsp;</p><p>&nbsp;</p><p>&nbsp;</p><ul><li>Gunakan sifat : lim x—&gt; 0 &nbsp; (sin ax)/x = a</li></ul><p>&nbsp;</p>