In Exercises 23-26, evaluate the trigonometric function by
memory or by constructing an appropriate triangle for the
given special angle.
23. (a) cos 60°
24. (a) cot 45°
25. (a) sin 45°
26. (a) sin 60°
(b) csc 30°
(b) cos 45°
(b) cos 30°
(b) tan 45°
27. (a) sin 10°
28. (a) tan 23.5°
29. (a) sin 16.35°
(c) tan 60°
(c) csc 45°
(c) tan 30°
(c) sec 30°
In Exercises 27-36, use a calculator to evaluate each
function. Round your answers to four decimal places. (Be
sure the calculator is in the correct angle mode.)
(b) cos 80°
(b) cot 66.5°
(b) csc 16.35°
23~29 Pls
