3 thoughts on “Back to school advice”

  1. x is an element of {30°, 90°, 270°, 330°}.
    To solve, just set y:=cos(x), you’ll find that y=0 or y=sqrt(3)/2. This means that x has to be one of the four solutions above because it has to be in [0°,360°).

  2. Actually, it’s impossible to solve equation, because x should be defined in radians, not degrees. This is first rule of trigonometric equations.

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