设复数z
1=sinα+i,z
2=m+(m-cosα)i,其中i为虚数单位,α∈[0,2π),m∈R,且z
1=z
2.
(1)求α的值;
(2)设t=cosα+isinα,求f(t)=1+t+t
2+…+t
n-1(n∈N*).
考点分析:
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