SOLUTION: sec x + cos x = 3,then tan^2 x - sin^2 x is

SOLUTION: sec x + cos x = 3,then tan^2 x - sin^2 x is

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Question 715282: sec x + cos x = 3,then tan^2 x - sin^2 x is
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!

secx +cosx =3
square both sides

sec^2x= 1+tan^2x: cos^2x = 1-sin^2x

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