$$1+i^{10}+i^{100}-i^{1000}=$$
$0$
$$1-1+i^{100}-i^{1000}$$
$$i^{100}-i^{1000}$$
$$1-i^{1000}$$
$$1-1$$
$$0$$
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$$Re(1-1+i^{100}-i^{1000})$$
$$Re(i^{100}-i^{1000})$$
$$Re(1-i^{1000})$$
$$Re(1-1)$$
$$Re(0)$$