Evalute each of the following:

(i) +

(ii)

(iii)

(iv)

(v)

(vi)

(vii)

(viii)

(ix)

(x)

(xi) -

(i) -

=

=

=

(ii) +

=

=

=

(iii) -

=

=

=

(iv) -2 -

=

=

=

(v) +

=

=

=

(vi) +

=

=

=

(vii) +

=

=

=

(viii) -

=

=

=

(ix) +

=

=

=

(x) -

=

=

=

(xi) +

=

=

=