Z00071. Evaluate the following. (a) sin (5π/4) (b) cos (2π/3) (c) tan (-3π/4) (d) sec (-5π/4).

Z00071. Evaluate the following.

$(a) sin \left (\frac{5\pi }{4} \right ) \; \; \; \;\; \; (b) cos \left (\frac{2\pi }{3} \right )$

$(c) tan \left (-\frac{3\pi }{4} \right )\;\; \; (d) sec \left (-\frac{5\pi }{4} \right ).$

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