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Calculate the degree of acute angle with a calculator: ① sinα=0.2568, then ∠α =1453'; ② If cosα=0.2568, α = 75 7'; ③ If tanα=0.2568 is known, ∠α= 14 24'. Press the mode with a calculator. If there is a DEG, press the shift key first, then the trigonometric function sin key, and then input 0.2568 in turn, and you can get the answer: α ≈ 14 53' ② Press the shift key first. You can get the answer: α ≈ 75 7 ′ (3) Press the shift key first, then the trigonometric function tan key, and then input 0.2568 in turn, you can get the answer: α ≈14 24 ′. So the answers are: 14 53', 75 7', 18.