Question

Please help me with a few questions!!! ASAP!!
1. use the unit cirlcle to find the inverse function value in degrees
sin^-1( square root(3)/2
A. 60 <--- my answer
B. 240
C. 30
D. 300

2. which is the radian measure of an angle whose sine is 0.8? round your answer to the nearest decimal places.
A. 0.93
B. -2.22
C. 2.33
D. 4.06
3. what values for θ (0≤θ≤2pi) satisfy the equation?
2 sinθ cosθ + sqrt(2) cosθ= 0
A. pi/2, 3pi/4, 3pi/2, 7pi/4
B. pi/2, 3pi/4, 5pi/2, 7pi/4
C. pi/2,5pi/4, 3pi/2,7pi/4
D. pi/2, 5pi/4,3pi/4, 7pi/4

Answer 1

1.A. 2.D. 3.B