If A, B, and C be the angles of a triangle, then out of

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If A, B, and C be the angles of a triangle, then out of the following, the incorrect relation is :

In a triangle ABC,
A + B + C = 180°

⇒		A	+	B	+	C	= 90°
		2		2		2

⇒		A + B	= 90° -	C
		2		2

⇒ tan			A + B
			2

= tan		90° -	C		= cot	C
			2			2

cos		A + B		= sin	C
		2			2

sin	A + B	= cos	C
	2		2