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【简答题】
（I）①证明两角和的余弦公式C（α+β）：cos（α+β）=cosαcosβ-sinαsinβ；②由C（α+β）推导两角和的正弦公式S（α+β）：sin（α+β）= sinαcosβ+cosαsinβ；（Ⅱ）已知
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刷刷题刷刷变学霸
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