Express sinA in terms of secA
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look at the application of formula
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sinA = tanA × cos A
= tanA × 1/secA
= tanA / secA.....i)
tan²A = sec²A - 1
tanA =√sec²A-1
Put tanA √sec²A-1 in i)
sin A = √sec²A - 1 / secA
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