If `s e c^2theta=(4x y)/((x+y)^2)` is true if and only if `x+y!=0` (b) `x=y , x!=0` (c) `x=y` (d) `x!=0,y!=0`

If s e c^2theta=(4x y)/((x+y)^2) is true if and only if (a) x+y!=0 (b) x=y , x!=0 (c) x=y (d) x!=0,y!=0

sec^2theta=(4x y)/((x+y)^2) is true if and only if x+y!=0 (b) x=y ,x!=0 x=y (d) x!=0,y!=0

If sec^(2)theta=(4xy)/((x+y)^(2)) is true if and only if x+y!=0( b) x=y,x!=0(c)x=y(d)x!=0,y!=0

sec^(2)theta=(4xy)/((x+y)^(2)) is true if and only if x+y!=0 (b) x=y,x!=0x=y( d ) x!=0,y!=0

If s e c^2theta=(4x y)/((x+y)^2) is true if and only if................... (a) x+y!=0 (b) x=y , x!=0 (c) x=y (d) x!=0,y!=0

sin^2 theta= (4xy)/(x+y)^2 is true if and only if (A) x-y!=0 (B) x=-y (C) x+y!=0 (D) x!=0,y!=0

sin^(2)theta=(4xy)/((x+y)^(2)) is true if and only if (A)x-y!=0(B)x=-y(C)x=y(D)x!=0,y!=0

The equation of the normal to the curve x=a\ cos^3theta,\ \ y=a\ s in^3theta at the point theta=pi//4 is x=0 (b) y=0 (c) x=y (d) x+y=a

x=2, y=−1 is a solution of the linear equation (a) x+2y=0 (b) x+2y=4 (c) 2x+y=0 (d) 2x+y=5

If O Aa n dO B are equal perpendicular chords of the circles x^2+y^2-2x+4y=0 , then the equations of O Aa n dO B are, where O is the origin. (a) 3x+y=0 and 3x-y=0 (b) 3x+y=0 and 3y-x=0 (c) x+3y=0 and y-3x=0 (d) x+y=0 and x-y=0