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27 May, 20:58

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

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  1. 27 May, 22:32
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    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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