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Prove that sec(-pi/4) = sqrt2.
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Prove that sec(-pi/4) = sqrt2.

User Daniel McQuiston
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1 Answer

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sec ( -π/4 ) =
=1 / cos( -π/4 ) =
= 1 / cos (π/4 ) =
= 1 / √2/2 = 2/√2 = √2
( correct )
User Mwchase
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