The complement of an acute angle is an acute angle. always, never, or sometimes?

Given that ot =5, xt=12, and ox= 13 is xy tangent to circle o at t? explain.

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.

Given sin28.4=.4756, cos28.4=.8796, and tan28.4=.5407 find the cos of 61.6