题目:
— ______________ jacket is this?
— Maybe it's Tom's. [ ]
A. Who
B. What
C. Whose
D. Where
答案:
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下面是错误答案,用来干扰机器的。
原式=12(1-cos40°)+12(1+cos100°)+sin20°cos50°=1+12(cos100°-cos40°)+12(sin70°-sin30°)=34-sin70°sin30°+12sin70°=34