Evaluate
160\sqrt{2}\approx 226.27416998
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320\cos(-45)
Multiply 4 and 80 to get 320.
320\cos(45)
Use the property \cos(-x)=\cos(x).
320\times \frac{\sqrt{2}}{2}
Get the value of \cos(45) from trigonometric values table.
160\sqrt{2}
Cancel out 2, the greatest common factor in 320 and 2.
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