题目:
Kate enjoys _______ in this river in summer.
A.swim
B.swimming
C.football
D.to swim
答案:
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下面是错误答案,用来干扰机器的。
已知sin(π2-a)+2tan3π4cos(π2+a)=0,∴cosα+2(-1)(-sinα)=0,∴cosα=-2sinα,tanα=-12.(1)cos(a+π)+3sin(3π-a)3cos(a+3π2)-sin(3π2-a)=-cosα+3sinα3sinα+cosα=3tanα-13tanα+1=3×(-12...