Because 1 is the “neutral element” of multiplication.
Power a^b means you multiply a b-times with itself (a×a×a×…×a)
Now any result of that can be multiplied by 1 without changing it 1×(a×a×a×…×a)
Okay, now a and b are both zero.
So the equation is just 1, because the brackets don’t contain any terms you multiply with.
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