Prove that cos 2 x (tan 2 x + 1) = 1 for all values of x
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Prove that cos2 x (tan2 x + 1) = 1 for all values of x where cos x and tan x are defined.
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Related Book For 
Edexcel AS And A Level Mathematics Pure Mathematics Year 1/AS
ISBN: 9781292183398
1st Edition
Authors: Greg Attwood
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