Evaluate
-\frac{1}{4}=-0.25
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-\frac{1}{2}\sin(30)
Get the value of \sin(30) from trigonometric values table.
-\frac{1}{2}\times \frac{1}{2}
Get the value of \sin(30) from trigonometric values table.
-\frac{1}{4}
Multiply -\frac{1}{2} and \frac{1}{2} to get -\frac{1}{4}.
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