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" -6."(1+tan^(2)(45^(@)-A))/(1-tan^(2)(4...

" -6."(1+tan^(2)(45^(@)-A))/(1-tan^(2)(45^(@)-A))=cosec2A" ."

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(1) (1-tan^(2)45^(@))/(1+tan^(2)45^(@)) =

(1-tan^(2)(45^(@)-A))/(1+tan^(2)(45^(@)-A)) is equal to

(1-tan^(2)(45^(@)-theta))/(1+tan^(2)(45^(@)-theta))=

( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@)) =

( 1-tan ^(2) 45^(@) )/( 1+tan ^(2) 45^(@)) =