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tan B = 4/3
cos B = 3/5
sec B = 1/cos = 1/3/5 = 5/3
(0,8)² + cos² β = 1
0,64 + cos² β = 1
cos² β = 1 - 0,64
cos² β = 0,36
cos β = √0,36
cos β = 0,6
tan β =
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sec β =
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