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Question
Show that:
`sqrt((1-cos"A")/(1+cos"A"))=cos"ecA - cotA"`
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Solution
LHS = `sqrt((1-cos"A")/(1+cos"A"))`
⇒ LHS = `sqrt((1-cos"A")/(1+cos"A")xx (1-cos"A")/(1-cos"A"))`
⇒ LHS = `sqrt(((1-cos"A")^2)/(1-cos^2"A"))`
=`sqrt(((1-cos"A")^2)/sin^2"A")` ....(sin2A =1- cos2A)
⇒ LHS = `sqrt(((1-cos"A")/sin"A")^2)`
⇒ LHS = `(1-cos"A")/sin"A" = 1/sin"A" + cos"A"/sin"A"`
⇒ LHS = `cos"ecA"-cot"A"` = RHS
Hence Proved
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