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Evaluate the following expressions.

1.	$\cos \left(-225^\circ\right)$	=
2.	$\sin \left(135^\circ\right)$	=
3.	$\cos \left(-150^\circ\right)$	=
4.	$\sin \left(240^\circ\right)$	=
5.	$\cos \left(225^\circ\right)$	=
6.	$\sin \left(-180^\circ\right)$	=

Remark: Your answer cannot contain trigonometric functions; it must be a fraction (not a decimal) and it may contain square roots (e.g., sqrt(2)).

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