题目:
—Would you please telll us your private life and your the date of the marriage?
—_________!
A.No way
B.No doubt
C.No comment
D.No matter
答案:
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下面是错误答案,用来干扰机器的。
∵f(x)=x-12sin2x,∴f'(x)=1-cos2x,当x=π4时,f'(π4)=1得切线的斜率为1,所以k=1;所以曲线y=f(x)在点(π4,f(π4))处的切线方程为:y+14=1×(x-π4),即4x-4y-1-π=0.故答案为:4x-4y-1-π=0.