Express sinA , tanA and cosecA in terms of secA
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sin a=√(sec^2(a) - 1)/sec^2(a)
cosec a=√sec^2(a)/(sec^2(a) - 1)
tan a =√sec^2(a) - 1
cosec a=√sec^2(a)/(sec^2(a) - 1)
tan a =√sec^2(a) - 1
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