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Evalute each of the following:
(i) +
(ii)
(iii)
(iv)
(v)
(vi)
(vii)
(viii)
(ix)
(x)
(xi) -
(i) -
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(ii) +
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(iii) -
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(iv) -2 -
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(v) +
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(vi) +
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(vii) +
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(viii) -
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(ix) +
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(x) -
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(xi) +
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