ABC , = , = 8, `∠`(tg, BAC) = `+`(`*`(`/`(1, 2), `*`(sqrt(5)))). .
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01 ABC , = , = 8, `∠`(tg, BAC) = `+`(`*`(`/`(1, 2), `*`(sqrt(5)))). .
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02 = , = 8, tg ∠BAC = `+`(`*`(`/`(1, 2), `*`(sqrt(5)))). .
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03 ABC = = 10, cos A = 0.8. . 

04 ABC = = 15, cosA = 0.4. . 

05 ABC = = 16, cos = 0.75. .