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推导正割函数及余割函数的导数公式 (secx)’= secxtanx (cscx)’= -cscxcotx
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举一反三
【单选题】Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, a...
A.
in his mind
B.
in his laboratory
C.
with microscope
D.
with telescopes
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【单选题】Task 1 Directions: After reading the following passage, you will find 5 questions or unfinished statements, numbered 36 through 40. For each question or statement there are 4 choices marked A, B, C, a...
A.
in his mind
B.
in his laboratory
C.
with microscope
D.
with telescopes
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