Question: 15) Let a = (9, 1) and 8 = ( 2+13, 1- 253). Show that the angle i Between a and & satisfies cos 9

15) Let a = (9, 1) and 8 = ( 2+13, 1- 253). Show that the angle i Between a and & satisfies cos 9 = 1/9. (16) If 19 1= 181=1 and I is the angle from a . ... to & is 8= 2013, show that the angle from " = 20 +8 to d = a-28 satisfies cosy= 191/ 14

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