" Q."7quad lim_(x rarr(pi)/(2))[1-tan((x)/(2))][1-sin x]

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lim_ (x rarr (pi) / (2)) ([1-tan ((x) / (2))] [1-sin x]) / ([1 + tan ((x) / (2))] [pi-2x] ^ (3))

lim_(x rarr 1) (1-x) tan((pi x)/2)

lim_ (x rarr (pi) / (2)) ((1-tan ((x) / (2))) (1-sin x)) / ((1 + tan ((x) / (2))) ((pi-2x) ^ (3)))

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