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(√5)² = 2² + BC²
5 = 4 + BC²
BC² = 5-4
BC = √1
BC = 1
tan α = BC/AB = 1/2 (E)
17. Cos β = 4/5
cos β = b/c
a² + b² = c²
a² + 4² = 5²
a² = 25 - 16
a = √9
a = 3
tan β = a/b = 3/4 (A)