Definitions of sine, cosine, tangent and cotangent
Answers are for parents and teachers.
1
Find sin(−π/2) and cos(−π/2).
sin(−π/2) = −1, cos(−π/2) = 0
2
Compute 4 sin 30° + 2 cos 0° − 3 tan 45°.
1
3
Solve cos t = 1.
t = 2πk, k ∈ Z
4
Solve sin t = 1.
t = π/2 + 2πk, k ∈ Z
5
Are sin α = −0.7 and cos α = 2 possible? Explain.
sin α = −0.7 is possible (between −1 and 1); cos α = 2 is not (2 > 1).