To further justify the Cofunction Theorem, use your calculator to find a value for each pair of trigonometric functions below. In each case, the trigonometric functions are cofunctions of one another, and the angles are complementary angles. Round your answers to four places past the decimal point. sin 23°, cos 67°
A)sin 23° = 0.3907, cos 67° = -0.9205
B)sin 23 ° = -0.3907 , cos 67 ° = 0.9205
C)sin 23 ° = 0.3977 , cos 67 ° = 0.9135
D)sin 23 ° = 0.3907 , cos 67 ° = 0.3907
E)sin 23 ° = 0.3857 , cos 67 ° = 0.9205

Question

To further justify the Cofunction Theorem, use your calculator to find a value for each pair of trigonometric functions below. In each case, the trigonometric functions are cofunctions of one another, and the angles are complementary angles. Round your answers to four places past the decimal point. sin 23°, cos 67° ​
A)sin 23° = 0.3907, cos 67° = -0.9205
B)sin 23 ° = -0.3907 , cos 67 ° = 0.9205
C)sin 23 ° = 0.3977 , cos 67 ° = 0.9135
D)sin 23 ° = 0.3907 , cos 67 ° = 0.3907
E)sin 23 ° = 0.3857 , cos 67 ° = 0.9205

Quizplus · Accepted Answer

The Cofunction Theorem states that the sine of an angle is equal to the cosine of its complement, and vice versa. Since 23° and 67° are complementary (adding up to 90°), sin(23°) should equal cos(67°).

To Further Justify the Cofunction Theorem, Use Your Calculator to Find