Problem:
A robin and a swallow are perched at the tops of two trees, as shown. Given the angles of inclination
between the apple and the birds, which bird is closer to apple and by how much?
?
9m
?
51°
31°
10m
Exercises:
Exercise:
Find a sentence like this to remember SohCahToa
“Some Old Hag Cracked All Her Teeth On Apples”
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Solve the trigonometric equations in 0; 2:
1 − 2 cos + sen = 0
2 cos cos − 1 = cos x
2 sen + 3 = 0
3
2 cos 5 x − 2 = 0
(2 cos x − 1) − (2 cos x − 1) = 0
2
4 sen 3 x − senx = 0
3sen 2 x − 2senx cos x − cos 2 x + 1 = 0