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Algebra II & Trigonometry
A2.A.58
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Cofunctions Worksheet
Know and apply the co-function and reciprocal relationships between trigonometric ratios
In 1 – 12, write each expression as a function of an acute angle whose measure is less than 45.
1. sin 80
2. tan 72
3. sin 50
4. cos 67
5. sec 83
6. cot 65
7. csc 58
8. cos 75
9. sin 88
10. tan 56.5
11. cot 250
12. cos 120
In 13 – 26, each equation contains the measures of two acute angles. Find a value of  for which the statement is true.
13. sin 10 = cos 
14. tan 48 = cot 
15. sec 70 = csc 
16. cot 8.6 = tan 
17. csc 85 = sec 
18. cos 17 = sin 
19. sin  = cos 2
20. tan  = cot 5
21. sin  = cos 
22. sec  = csc( + 60)
23. sec 2 = csc( + 15)
24. cos( + 10) = sin(3 + 8)
25. tan( + 8) = cot(90  2)
26. cot( + 7) = tan(2 + 7)