If x=cosecA+cosA and y=cosecA-cosA then prove that (2/x+y) the whole square +(x-y/2) the whole square=1
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(2/x+y)^2+(x-y/2)^2
(2/2cosecA)^2+(2cosA/2)^2
(1/cosecA)^2+(cosA)^2
we know that 1/cosecA=sinA
(sinA)^2+(cosA)^2
1
(2/2cosecA)^2+(2cosA/2)^2
(1/cosecA)^2+(cosA)^2
we know that 1/cosecA=sinA
(sinA)^2+(cosA)^2
1
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