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How do you simplify tan2x to sec2x?

1 Answer

May 30, 2015

Use the trig identity:

$1 + {tan}^{2} 2 x = \frac{1}{{cos}^{2} 2 x} = {sec}^{2} 2 x$ $1 + tan^2 2x = 1/(cos^2 2x) = sec^2 2x$

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