csc(x)*sin(x) =1
csc((\pi )/(2))=1,
csc((\pi )/(2)+\pi )=-1
csc((\pi )/(2)+2*\pi )=1
csc(x)*sin(x) =1
csc((\pi )/(2))=1,
csc((\pi )/(2)+\pi )=-1
csc((\pi )/(2)+2*\pi )=1
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学无止境。
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10/17/2023 postreply
19:41:37
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国内高等数学分数学一(数学类专业)、数学二(工理科),一直到数学五(财务专业)
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10/18/2023 postreply
04:19:18
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