State Whether the Following Expressions Are Positive or Negative, Without $\cos 135^{\circ}$

State whether the following expressions are positive or negative, without using your calculator or your book.
(a) $\cos 135^{\circ}$
(b) $\sin 179^{\circ}$
(c) $\cot 147^{\circ}$
(d) $\csc \left(-700^{\circ}\right)$
(e) $\tan \left(439^{\circ}\right)$
(f) $\sec \left(-149^{\circ}\right)$