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01-05-2017
Mathematics

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Which expression is equivalent to (1 – sin2 x)(sec x)?

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Ellsonic Ellsonic

01-05-2017

sin(2x) = 2sin(x)cos(x) so

sec(x)sin(2x) = 2sec(x)sin(x)cos(x) = 2sin(x)

because sec(x)cos(x) = 1.

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