If the expression exp `{1+|cosx|+cos^(2)x+|cos^(3)x|+ . . . . oo)log_(e)4}` satisfies the equation `y^(2)-20y+64=0" for "0ltxltpi`, then the set of value of x is

If e^[(sin^(2)x+sin^(4) x +sin^(6)x+.... oo) log_e2] satisfies the equation x^(2)-9x+8=0 , then the value of (cos x )/( cos x+ sin x ) , is

If exp{ ( sin^(2) x + sin^(4) x + sin^(6) x + …. "Upto" infty ) log_(e) 2 } satisfies the equation x^(2) - 17x + 16 = 0 then the value of (2 cos x )/(sin x +2 cos x ) (0 lt x lt pi//2) is

If exp(sin^(2)x+sin^(4)x+sin^(6)x....... upto oo)log_(e)2 satisfies the equation x^(2)-17x+16=0 then the value of (2cos x)/(sin x+2cos x),(0

If exp [(sin^(2)x+sin^(4) x +sin^(6)x+.... oo)" In" 2] satisfies the equation y^(2)-9y+8=0 , then the value of (cos x )/( cos x+ sin x ),0 lt x lt (pi)/(2) , is

If exp [(sin^(2)x+sin^(4) x +sin^(6)x+.... oo)" In" 2] satisfies the equation y^(2)-9y+8=0 , then the value of (cos x )/( cos x+ sin x ),0 lt x lt (pi)/(2) , is

If exp [(sin^(2)x+sin^(4) x +sin^(6)x+.... oo)" In" 2] satisfies the equation y^(2)-9y+8=0 , then the value of (cos x )/( cos x+ sin x ),0 lt x lt (pi)/(2) , is

If exp [(sin^(2)x+sin^(4) x +sin^(6)x+.... oo)" In" 2] satisfies the equation y^(2)-9y+8=0 , then the value of (cos x )/( cos x+ sin x ),0 lt x lt (pi)/(2) , is