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5²+a²=8²
25+a²=64
a²=39 /√
a=√39
b=5
c=8
cosβ=a\c=√39\8
sinβ= b\c=5\8
tgβ=sin\cos=5\8 ÷√39\8= 5\8 * 8\√39 =
=5\√39=5\√39 * √39\ √39=5√39 \39