prove this trigonometric equation;
- tan^2x + sec^2x = 1

prove this trigonometric equation;
- tan^2x + sec^2x = 1

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\[-\tan^2x+\sec^2x=1\] this?

hmm that's one of the identities only rearranged...

there is a trig identity which is
\[\tan^2x+1 =\sec^2x \]

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