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Step-by-step explanation:
(cotA + cosecA -1) / (cotA + 1 - cosecA) = 1/(cosecA - cotA)
LHS
replace 1(in numerator) by
cosec^2A - cot^2A = 1
{cotA + cosecA - (cosec^2A - cot^2A)} / (cotA + 1 - cosecA)
{cotA + cosecA - (cosecA + cotA)(cosecA - cotA)} /
(cotA + 1 - cosecA)
take (cosecA + cotA) common from numerator
(cosecA + cotA){1 - (cosecA - cotA)} / (cotA + 1 - cosecA)
(cosecA + cotA){1 - cosecA + cotA} / (cotA + 1 - cosecA)
(1 - cosecA + cotA) will cancel out
cosecA + cotA
now rationalise
(cosecA + cotA)×(cosecA - cotA) /(cosecA - cotA)
(cosec^2A - cot^2A) / (cosecA - cotA)
we know that
cosec^2A - cot^2A = 1
hence
1/ (cosecA - cotA)
LHS = RHS
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