EASY PRACTICE PROBLEMS!
Solve using the Unit Circle provided(answers
at bottom of page):
Ex. cos 90°=0
why? Because the x-coordinate at 90° is 0!
Ex. sin45°=√2 /2 why? Because the y-coordinate at 45° is √2 /2!
1) cos 180°=?
2) cos 270°=?
3) sin 210°=?
4) sin 45°=?
Answers:
1)-1
2)0
3)-1/2
4) √2 /2