Are the equations sin u 5 cos (90 2 u) and cos u 5 sin (90 2 u) true for all real
Chapter 12, Problem 1(choose chapter or problem)
Are the equations sin u 5 cos (90 2 u) and cos u 5 sin (90 2 u) true for all real numbers or only for values of u in the interval 0 ,u, 90?
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