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Nadusha1986 [10]
3 years ago
13

Sec^4x-tan^4x=sec^2x+tan^2x

Mathematics
1 answer:
tino4ka555 [31]3 years ago
5 0
\sec^4x-\tan^4x=(\sec^2x-\tan^2)(\sec^2x+\tan^2x)=\sec^2x+\tan^2x

since \tan^2x+1=\sec^2x.
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