`[{(-(1)/(2))^(2)}^(-2)]^(-1)=?`

1+(1)/(2)+(1)/(2^(2))+...+(1)/(2^(n-1))=

The sum to n terms of series 1+(1+(1)/(2)+(1)/(2^(2)))+(1+(1)/(2)+(1)/(2^(2))+(1)/(2^(3))+(1)/(2^(4)))+

The value of ((1)/(2)-:(1)/(2)"of "(1)/(2))/((1)/(2)+(1)/(2) "of"(1)/(2)) is

The orthocentre of triangle with vertices (2,(sqrt(3)-1)/(2)),((1)/(2),-(1)/(2)),(2,-(1)/(2))

(sqrt((1)/(2)))sqrt(((1)/(2)+(1)/(2)sqrt(((1)/(2)))sqrt(((1)/(2)+(1)/(2)sqrt((1)/(2)+(1)/(2)sqrt((1)/(2)))))_(-.2))

The value of (1)/(2+(1)/(2-(1)/(2-(1)/(2))))

Find the trace of A if A=[[1,2,-(1)/(2)],[0,-1,2],[-(1)/(2),2,1]]