cos2x = 1/sec 2x, so if sec(2x) = 3 then cos(2x) = 1/3.
Amy C.
asked • 03/18/21if sec (2x) = 3, then [ ? ] =1/3
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Mark M. answered • 03/18/21
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1 / 3 is the inverse of 3.
What is the inverse of secant?
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