Ответ:
tgх=1, 0<х<π/2 ⇒ х=π/4.
sin π/4 =√2/2, cos π/4 =√2/2.
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Ответ:
tgх=1, 0<х<π/2 ⇒ х=π/4.
sin π/4 =√2/2, cos π/4 =√2/2.