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

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

A + B + C = π

⇒		A + B	=	π	-	C
		2		2		2

⇒ sin		A + B
		2

= sin		π	-	C
		2		2

= cos	C
	2

Similarly,

cos		A + B		= sin	C
		2			2

cot		A + B		= tan	C
		2			2

tan		A + B		= cot	C
		2			2

tan		A + B		= sec	C
		2			2