Question

please solve this question 34aur35

Answer 1

x+y=2cosecA
x-y=2cosA
then
${( \frac{2}{x + y} )}^{2} + {( \frac{x - y}{2} )}^{2} - 1$
=
${( \frac{2}{2 \csc(a) } )}^{2} + {( \frac{2 \cos(a) }{2}) }^{2} - 1$
=
${(\sin(a) )}^{2} + { (\cos(a) )}^{2} - 1$
=1-1=0...proved..
same try the next one.....
now you can do next one yourself ..
let try....