Найти значение выражения:
5ctg13π/2 + 2Cos21π/4 + 2Sin41π/4 =
= 5ctgπ/2 + 2Cos3π/4 + 2Sinπ/4 =
= 5ctgπ/2 + 2Cos(π- π/4) + 2Sinπ/4 =
= 5ctgπ/2 - 2Cosπ/4 + 2Sinπ/4 =
= 0 - √2 + √2 = 0
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Answers & Comments
5ctg13π/2 + 2Cos21π/4 + 2Sin41π/4 =
= 5ctgπ/2 + 2Cos3π/4 + 2Sinπ/4 =
= 5ctgπ/2 + 2Cos(π- π/4) + 2Sinπ/4 =
= 5ctgπ/2 - 2Cosπ/4 + 2Sinπ/4 =
= 0 - √2 + √2 = 0