3 1 (− ) sin 60º = − 3 2 tan 720º = cot 720º = 1 = = 0 0 not defined ⎝ 2 2 ⎠ 1 0 (− ) cos 60º = 1 2 66. The point on the unit circle that corresponds to 7π ⎛ 3 ⎞ ⎜ − (0, is − 1) . ⎟ (− ) tan 60º = ⎝ 2 ⎠ = − 3 ⋅ 2 = − 3 θ = 630º = 1 2 −1 ⎛ 1 ⎞ 2 1 ⎜ ⎟ = = = cos 630º 0 sec 630º 1 not defined ⎝ ⎠ csc 630º = sin 630º = −1 = −1 (− ) = = ⎛ − ⎞ ⋅ = − csc 60º 1 1⋅ 2 3 2 3 0 ⎛ ⎞ 3 ⎜ 3 ⎟ 3 3 − ⎜ − ⎟ ⎝ ⎠ ⎝ ⎠ = = tan 630º 1 not defined 0 (− ) sec 60º = 1 = 1⋅ 2 = = = 2 cot 630º 0 0 ⎛ 1 ⎞ 1 ⎜ ⎟ −1 ⎝ ⎠ ⎛ ⎞ 1 Set the calculator to degree mode: 67. ⎜ ⎟ (− ) cot 60º = ⎝ ⎠ = ⋅ ⎜ − ⎟ ⋅ = ≈ sin 28º 0.47 . − ⎛ ⎞ ⎝ 3 2 3 ⎠ 3 3 − ⎜ 2 ⎟ ⎝ ⎠
3 sin (− 60º ) = − 3 2 ⎝ 2 2 ⎠ tan 720º = 0 = 0 1 1 cot 720º = 1 = not defined 0 cos (− 60º ) = 1 2 66. The point on the unit circle that corresponds to 7π ⎛ 3 ⎞ ⎜ − ⎟ tan (− 60º ) = ⎝ 2 ⎠ = − 3 ⋅ 2 = − 3 θ = 630º = 2 is (0, − 1) . 1 ⎛ 1 ⎞ 2 1 ⎜ ⎟ ⎝ ⎠ sin 630º = −1 cos 630º = 0 csc 630º = = −1 −1 sec 630º = 1 = not defined csc (− 60º ) = 1 = 1⋅ ⎛ − 2 ⎞ ⋅ 3 = − 2 3 0 ⎛ 3 ⎞ ⎜ 3 ⎟ 3 3 − ⎜ − ⎟ ⎝ ⎠ ⎝ ⎠ tan 630º = 1 = not defined 0 sec (− 60º ) = 1 = 1⋅ 2 = 2 cot 630º = 0 = 0 ⎛ 1 ⎞ 1 ⎜ ⎟ ⎝ ⎠ ⎛ 1 ⎞ ⎜ ⎟ cot (− 60º ) = ⎝ ⎠ = ⋅ ⎜ − ⎟ ⋅ = − −1 67. Set the calculator to degree mode: sin 28º ≈ 0.47 . ⎛ 3 ⎞ 2 ⎝ − 3 ⎠ 3 3 ⎜ 2 ⎟ ⎝ ⎠
62514-0132318806_ISM_02-1.docx