Because you're working in base 8:
(-38)2 - 18 = 118 - 18 = 108
Or you've made a mistake:
(-3)2 - 1 = 9 - 1 = 8
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square root of 8
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21-3=17 cause in 21 the 1 becomes a 10 and and the 2 becomes a 1 so 10 minus 3 equals 7 and 1 minus 0 equals 1 so the answer is 17
No, unless "a" happens to be equal to 0, or to 1.
sin4x=(4sinxcosx)(1-2sin^2x)