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   ocr: cos(O(k - +1))= a 2 Icos((k -Da)+cos(&+D)a): 2 Elowt@-Del-cne-Dal cos(ka)cos(0)-Sin(ka)sin(a) intatk-D)--lant(e-Da)-sin(A-+Da): Pemdd-Doraeue-De) sin(ka) cos(@)-cosikc)sin(@) Example 5: Deriving COS (a(k+1)) C and sin (a(k+1)from a table ofconstants.