Isolate the trig function, then find the angles in the given interval that match that value. Check degrees versus radians before you name them. Right-triangle values are in right-triangle trigonometry.
Value first, then the circle
sin θ = 1/2 is 30° and 150° in one full turn of degrees. Graphs can show the same solutions, in trig graphs in Desmos. Amplitude and period tell you how often they repeat, in amplitude and period.
The bottom line
Isolate, then list angles in the interval. Mode mismatch is a silent miss.
Start practicing
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