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Mattias Engdegård authored
* lisp/calc/calc-alg.el (calcFunc-sec, calcFunc-csc, calcFunc-cot): Check that `math-known-sin' and `math-known-tan' succeeded before using their value in arithmetic. * test/lisp/calc/calc-tests.el (calc-test-trig): Add regression tests. Backport from master.
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