(tan + sec-1) (tan + sec+1) =2sin/1-sin
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Used formula :-
( a - b ) ( a + b ) = a² - b²
( a + b )² = a² + b² + 2ab
Used Identity :-
1 + tan²∅ = sec²∅
sin²∅ + cos²∅ = 1
tan∅ = sin∅/cos∅
sec∅ = 1/cos∅
( a - b ) ( a + b ) = a² - b²
( a + b )² = a² + b² + 2ab
Used Identity :-
1 + tan²∅ = sec²∅
sin²∅ + cos²∅ = 1
tan∅ = sin∅/cos∅
sec∅ = 1/cos∅
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