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Give the general solution for the following trigonometric equation without a calculator.

cos⁡(z)=02\displaystyle {\cos{{\left({z}\right)}}}=\frac{{0}}{{2}}

r.a.=\displaystyle {r}.{a}.=∘\displaystyle ^\circ

z=\displaystyle {z}=   where k∈Z\displaystyle {k}\in{Z}

orz=\displaystyle {\quad\text{or}\quad}{z}=   where k∈Z\displaystyle {k}\in{Z}

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