Express the trigonometric ratio tan A in terms of sec A
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we know that sec^2A-tan^2A=1
-tan^2=1-sec^2A
tan^2A=sec^2A-1
tanA=root of sec^2A-1
-tan^2=1-sec^2A
tan^2A=sec^2A-1
tanA=root of sec^2A-1
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