What type of rationalusation is it. Why sign has not changed?

What type of rationalusation is it. Why sign has not changed? 23:27 posted 1 day ago er all the identities and try to make , ert all trignometric function in sin o sec9-tan 9 9+1 divide the numertor and denomi 9-1 cos 9 cos G 9+sec9 tal* 6 tan 9+sec9- tan 9-sec tan 9- sec9+ tan 9-sec

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