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sin(-11π/4)
人气:199 ℃ 时间:2020-09-29 04:38:47
解答
sin(-11π/4)
=-sin(11π/4)
=-sin(11π/4-2π)
=-sin(3π/4)
=-sin(π-π/4)
=-sin(π/4)
=-√2/2
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