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1/ cot 45
- Tan 45 = - 1
b. sec 225
sec ( 180 + 45)
- sec 45
- 1/ cos 45 = - √2
c. cot (360-60)
- cot 60
- 1/ √3
- 1/3 √3
d.csc 150
csc (90+60)
sin 60 = 1/2 √3
e.sec 180^2 / csc 0,5 180
cos 180^2 / sin 90
1/1 = 1