calculate value of sin 30
<p>I can not find the correct value of sin 30 ,</p>

<pre><code> double degrees = 30.0;
 double radians = Math.toRadians(degrees);
 System.out.println(Math.sin(radians));
</code></pre>

<p>which produces .499999999 but the exact value matching to calculator is .5</p>

<p>please help me..</p>
