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1. ; f , u , v ¹ 0 ; v ¹ f
2. ; b , c ¹ 0
3. ; x ¹ - 1 , y ¹
4. ; t ¹ 0
5. ; m ¹ 0
6. (a) ; n ¹ 0 , 1 (b) d = 3
7. (a) SA =
(b) SA = or SA =
(c) SA =
8. (a) A = 2xy
(b)
(c) x = 5 and x =