# Find the primary solution of cosθ=−0.3

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The solution of cos θ = −0.3 is θ = 107.45760312 degreesSolution:Given that we have to find the primary solution of [tex]cos \theta = -0.3[/tex]To solve this equation, you must find the unknown (theta)[tex]cos \theta = -0.3[/tex]Use the inverse of cosine (Arccos) to find the angle measurement (in degrees) of theta[tex]\theta = arccos (-0.3)[/tex]We know that arccos (-0.3) = 107.45760312 degrees[ If you reference a unit circle or use a calculator ][tex]\theta = 107.45760312^{\circ}[/tex]Therefore solution of cos θ = −0.3 is θ = 107.45760312 degrees

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