(1)sin 54°≈0.809,
(2)cos40°≈0.766,
(3)tan38°≈0.781,
(4)sin17°54′≈0.307,
(5)cos57°32′58″≈0.537,
(6)tan73°20′≈0.287,
(7)原式≈(0.151) 2-0.579+1.270≈0.023-0.579+1.270≈0.714,
(8)原式≈0.456×2.194≈1.00.
(1)sin 54°≈0.809,
(2)cos40°≈0.766,
(3)tan38°≈0.781,
(4)sin17°54′≈0.307,
(5)cos57°32′58″≈0.537,
(6)tan73°20′≈0.287,
(7)原式≈(0.151) 2-0.579+1.270≈0.023-0.579+1.270≈0.714,
(8)原式≈0.456×2.194≈1.00.