(1)sinA=0.9816;
(2)cosA=0.8607;
(3)tanA=0.1890;
(4)tanA=56.78.
(1)sinA=0.7,sinB=0.01;
(2)cosA=0.15,cosB=0.8;
(3)tanA=2.4,tanB=0.5.
(1)已知sinα=0.5018,求锐角α;
(2)已知tanθ=5,求锐角θ.
(1)sinα=0.5018.(2)cosA=0.6531.(3)tanβ=0.3750.
计算结果是.