6. 7. A line is drawn from a point P(x, y) on curve y = f(x), making an angle in anti-clockwise with the +ve x-axis which is supplementary to the one made by the tangent to the curve at P(x, y). The line meets the x-axis at A. Another line perpendicular to the first, is drawn from P(x, y) meeting the y- axis at B. If OA = OB, where O is the origin, then the curve which passes through (1, 1). (a) x-y+4xy = 4 (b) x2 y2-2xy +2=0 (c) x-y+ 2xy = 2 (d) x2 y2-4xy+4=0 Let p : Sindhu plays to win q: Sindhu gets Bharath Ratna Then the contrapositive of "-(-q^p)" is (a) If Sindhu plays to win then she gets Bharath Ratna (b) If Sindhu gets Bharat Ratna then she plays to win 8. (c) If Sindhu does not plays to win then she does not gets Bharat Ratna (d) If Sindhu does not get Bharat Ratna then she does not plays to win Let A and B are non-singular matrices of order 3 such that |A|=5 and A 1B + AB = 0, then A |A | - adj (adjB) is equal to (a) null matrix (b) 25A2-5B (c) 25A (d) 50A 9. Number of points of non-differentiability of f(x) = |||-1|+|cos x|; 2