The value of `cosycos(pi/2-x)-cos(pi/2-y)cosx+sinycos(pi/2-x)+cosxsin(pi/2-y)` is zero if (A) `x=0` (B) `y=0` (C) `x=y` (D) `npi+y-pi/4(n in Z)`

The value of cosy cos(pi/2-x)-cos(pi/2-y)cosx+sinycos(pi/2-x)+cosxsin(pi/2-y) is zero if (A) x=0 (B) y=0 (C) x=y (D) npi+y-pi/4(n in Z)

The value of cosycos(pi/2-x)-cos(pi/2-y)cosx+sinycos(pi/2-x)+cosxsin(pi/2-y) is zero if x=0 (b) y=0 x=y (d) npi+y-pi/4(n in Z)

The value of cos y cos((pi)/(2)-x)-cos((pi)/(2)-y)cos x+sin y cos((pi)/(2)-x)+cos x sin((pi)/(2)-y) is zero if (A)x=0(B)y=0(C)x=y(D)n pi+y-(pi)/(4)(n in Z)

The value of cos y cos ((pi)/(2) - x) - cos ((pi)/(2) - y) cos x + sin y cos ((pi)/(2) - x) + cos x sin ((pi)/(2) - y) is zero if

Select and write the correct answer from the given alternatives in each of the following:If cosycos(pi/2-x)-cos(pi/2-y)cosx+sinycos(pi/2-x)+cosxsin(pi/2-y)=0 then x-y =

If sinx+cosx=sqrt(y+1/y) for x in [0,pi] , then (a) x=pi/4 (b) y=0 (c) y=1 (d) x=(3pi)/4

If sinx+cosx=sqrt(y+1/y) for x in [0,pi] , then (a) x=pi/4 (b) y=0 (c) y=1 (d) x=(3pi)/4