Solve equations of the form cos(x)=a Trigonometry

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Course : Trigonometric identities, equations and laws
Exercise : Calculate sin(x) (or cos(x)) and tan(x) when cos(x) (or sin(x)) is known
Exercise : Convert a sum (or difference) of trigonometric functions into a product
Exercise : Convert a product of trigonometric functions into a sum (or difference)
Exercise : Solve equations of the form sin(x)=a
Exercise : Solve equations using the trigonometric identities
Exercise : Solve quadratric equations that involve trigonometric functions