(1/5)-1 = 1 / (1/5) = 5
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Same as saying 2^5 = 32
5 ^ -4 = 1/625, or one six-hundred and twenty-fifth.
0.25^-1 = 4
Cosine to the negative first power and cosine cancel each other out because cosine to the negative first power is one over cosine, and one over anything times anything is just one.
(-0.4).