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11 December, 02:06

What is the exact value of sec (-405degress) ? ... ?

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  1. 11 December, 04:13
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    Sec = 1 / (cos), you can add or subtract 360 degrees from any angle measurement without changing the value of any of the trig functions i. e. 405 degrees = 405-360=45. cos of 45 is sqrt (2) / 2 so sec405 = 2/sqrroot2
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