If 0° < A < 90°, the value of tan A

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=	tanA - secA - 1
	tanA + secA + 1

=	tanA - secA - (sec²A - tan²A)
	tanA + secA + 1

=	(tanA – secA) – (secA – tanA)(secA tanA)
	tanA + secA + 1

=	(tanA – secA) + (tanA – secA)(secA tanA)
	tanA + secA + 1

=	(tanA – secA)(1 secA tanA)
	tanA + secA + 1

= tanA – secA =		sinA	-	1
		cosA		cosA

=	sinA - 1
	cosA

If 0° < A < 90°, the value of	tan A – sec A –1	is
	tan A + sec A + 1

	sin A – 1
	cos A

	1 - sin A
	cos A

	1 - cos A
	sin A

	sin A + 1
	cos A