Correct Answer - b
`Sin17^(@)=(k)/(y)rArr(P)/(H)`
`rArr Sec17^(@)-sin73^(@)`
`=sqrt(y)/(sqrt(y^(2)-x^(2)))-(sqrt(y^(2)-x^(2)))/(y)`
`=(y^(2)-(y^(2)-x^(2)))/((y)sqrt(y^(2)-x^(2)))=(y^(2)-y^(2)+x^(2))/(ysqrt(y^(2)-x^(2)))`
`=(x^(@))/((y)(sqrt(y ^(2)-x^(2))))`