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Verified answer
Materi : Trigonometritan a + sec a = x
( tan a + sec a )² = x²
tan²a + sec²a + 2 tan a . sec a = x²
tan²a + tan²a + 1 + 2 tan a . sec a = x²
2 tan²a + 2 tan a . sec a = x² - 1
2 tan a (tan a + sec a) = x² - 1
2 tan a ( x ) = x² - 1
tan a =