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1809.
144
Centuries ago, Islam created the mathematics of 'Trigonometry'.
You have a typo.Its "centuries" instead of "centurys" Each century is 100 years, so 2 centuries would be 200 years. This year is 2013, so 200 years ago, it was 1813
Since there are 100 years in a century, you just multiply 100 x 4, which is 400 years in 4 centuries.