sinπ⼀8×sinπ5⼀8=

求过程,谢了
2024-11-15 13:32:23
推荐回答(1个)
回答(1):

sinπ/8×sinπ5/8=sinπ/8sinπ3/8
=sinπ/8cosπ/8
=1/2sinπ/4

=1/2*√2/2
=√2/4
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