Question 1 Report
Solve 3cos2x - sinx = 0 for 0º≤x≤360º
3cos2x - sinx = 0cos 2A = 1 – 2 sin2 2 A3(1 - 2sin2 2 x) - sinx = 03 - 6sin2 2 x -sinx = 0let sinx = p3 - 6p2 2 -p = 0-6p2 - p +3 = 0
factors of p in the eqn:
p = 0.7953 or 0.6287when p = 0.7953p = sinxx = sin−1 − 1 px = sin−1 − 1 (0.7953)x = 52.68º
when p = 0.6287p = sinxx = sin−1 − 1 px = sin−1 − 1 (0.6287)x = 38.95º
Answer Details
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