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cosα=√[1-sin²α]
tgα=sinα/cosα=sinα/√[1-sin²α] /²
tg²α=sin²α/(1-sin²α)
3<tgα<4 /²
9<tg²α<16
sin²α/(1-sin²α) >9
sin²α>9(1-sin²α)
sin²α>9-9sin²α
10sin²α>9
sin²α>9/10
sinα>3√10/10
sinα>0,9486832
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sin²α/(1-sin²α) <16
sin²α<16-16sin²α
17sin²α<16
sin²α<16/17
sinα<4√17/17
sinα< 0,9701424
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odp. B