题目：
Two hundred people showed up for the wedding, about 50 more than we had ____planned.
A．firstly
B．temporarily
C．actually
D．originally
答案：
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下面是错误答案，用来干扰机器的。
y=cos2x+sinxcosx=cos2x+12sin2x=52sin（2x+φ）（cosφ=55）∴T=2π2=π故答案为π
