Объяснение:
sinA= CB/AB
СВ найдем по теореме Пифагора ( 13²-5²=144=12)
sin A = 12/13
____
cos A = AC/AB =5/13
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tg A= CB/AC=12/5= 2 2/5
___
ctg A= AC/CB=5/12
Угол В:
sin B = AC/AB=5/13
____
cos B = CB/AB=12/13
____
tg B = AC/CB= 5/12
____
ctg B = CB/AC= 12/5= 2 2/5
