3-3x -1 14.Evaluate the value of cos x+cos + 2 }; x = [,1] (A) (B) (C) (D) 15.Let f(x) = px + qx + r be a polynomial function of second degree. If f(1) = f(1)and f'(p), f'(q), f'(r) are in A.P., then : (A) p=q=r (C) p, q,r are in A. P. (B) p, q,r are in H. P. (D) p, q,r are in G. P. 16. In a parabola y = 4ax, if P and P2 are lengths of perpendicular chords drawn through vertex then (PP2) 4/3 =? 3/2 (A) 16a (P/ + P3/2 (C) 4a (P/2 + P3/2 17.If a = 2x5 (A) 25 151 a2 = 8x11' 5x8 ' (B) (B) 16a (P2/3 + P2/3 (D) 4a (P2/3 + P2/3 and so on then a + a + a3 ++ a100 is: (C) / (D) 1 111 55