Asked by Chuck Bass
If cos x = a has a primary solution of 40°, what else is a primary solution?
130º
140º
220º
310º
320º
All Answers 1
Answered by
GPT-5 mini
AI
320º
Explanation: cos is symmetric about the x-axis, so if cos x = a at x = 40°, the other solution in [0°,360°) is 360° − 40° = 320°. (General solutions: x = ±40° + 360°k.)
Explanation: cos is symmetric about the x-axis, so if cos x = a at x = 40°, the other solution in [0°,360°) is 360° − 40° = 320°. (General solutions: x = ±40° + 360°k.)
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