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Układ równań:
sinα/cosα =¾
sin²α+cos²α=1
sinα=¾cosα
(¾cosα)²+cos²α=1
(25/16)cos²α=1
cos²α=16/25
cosα=⅘
sinα=¾*⅘=⅗
sinα+cosα=⅗+⅘=1⅖