" (b) "x^(2)-x-90

x^2-21 x+90

For all real value of x, the maximum value of the expression (x)/(x^(2)-5x+9) is 1( b) 45(c)90 (d) None of these

The line x+y=k meets the pair of straight lines x^(2)+y^(2)-2x-4y+2=0 in two points A and B. If O is the origin and angleAOB=90^(@) then the value of kgt1 is

Line x+ ay =1 cuts the circle x^(2)+y^(2)-4x-2y+1=0 at two points A and B such that Chord AB subtends an angle of 90^(@) at origin then sum of possible values of a is

Line x+ ay =1 cuts the circle x^(2)+y^(2)-4x-2y+1=0 at two points A and B such that Chord AB subtends an angle of 90^(@) at origin then sum of possible values of a is

In Figure, if l_1||l_2a n d\ l_3||l_4, what is y in terms of x? (a) 90+x (b) 90+2x (c) 90-x/2 (d) 90-2x

The bisects of exterior angles at B and C of triangle A B C meet at O . If A=x^@, then B O C= (a) 90^0+(x^0)/2 (b) 90^0-(x^0)/2 (c) 180^0+(x^0)/2 (d) 180^0-(x^0)/2

The bisects of exterior angles at B a n d C of /_A B C meet at Odot If /_A=x^0, then /_B O C= 90^0+(x^0)/2 (b) 90^0-(x^0)/2 180^0+(x^0)/2 (d) 180^0-(x^0)/2

For all real value of x , the maximum value of the expression x/(x^2-5x+9) is 1 (b) 45 (c) 90 (d) None of these

If 2cos^(2)x- sin^(2)x= -0.25 and 0^(@) le x lt 90^(@) , then x= ?