How to describe solution sets
Equations sin⁡x=a\sin x=a and cos⁡x=a\cos x=a are easy to read on the unit circle: intersect with the horizontal line y=ay=a (sine) or the vertical x=ax=a (cosine). If ∣a∣>1|a|>1, there are no solutions. If ∣a∣≤1|a|\leq1, use arcsin⁡\arcsin and arccos⁡\arccos, then add periods.
The period of sin⁡\sin and cos⁡\cos is 2π2\pi
Full content is available with a subscription.
Get full access to all courses on the platform for one year with a single payment.
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.