A little mental math gets me to one answer being 30 degrees ðŸ˜‰

Manuel

x is an element of {30Ã‚Â°, 90Ã‚Â°, 270Ã‚Â°, 330Ã‚Â°}.
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 [0Ã‚Â°,360Ã‚Â°).

piterk

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

LilyA little mental math gets me to one answer being 30 degrees ðŸ˜‰

Manuelx is an element of {30Ã‚Â°, 90Ã‚Â°, 270Ã‚Â°, 330Ã‚Â°}.

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 [0Ã‚Â°,360Ã‚Â°).

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