can someone help me with this trig problem please.

College Majors Science Majors
1

<p>evaluate expression using half angle formulas</p>

<p>8sin(22.5º)cos(22.5º)</p>

<p>i got 8squareroot of 2/2</p>

<p>is that right?</p>

2

<p>This is not the right place for this.</p>

<p>Use the rule that sin(2x) = 2sin(x)cos(x).</p>

<p>Let x = 22.5. Then 2x = 45 and </p>

<p>8sin(22.5)cos(22.5) = 4 * 2sin(22.5)cos(22.5) = 4 * sin(45) = 4 sqrt(2)/2 = 2 sqrt(2).</p>

<p>Let me know if I made a mistake.</p>