Trigonometry

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Revisit answers that need work or are due. A fresh question on the same goal comes first.

How to enter angles, expressions and complete sets

Use pi, sqrt(3), asin(1/3), acos(1/3) or atan(3). Inverse functions use radians; a degree field expects the number of degrees. List every distinct angle with commas, for example 0, pi, 2*pi; these are different inputs when included. For no solutions enter empty. Give coordinates as (pi/4,3); (5*pi/4,3). Keep interval brackets, for example (-pi,pi]. In expression fields use sin(x), cos(x), tan(x) and powers such as sin(x)^2. Simplify unsupported forms before entering them; a final value cannot establish a proof or a sketch. Those and written method marks need review. Numerical fields ask for the final angles to 3 decimal places; keep intermediate angles unrounded.

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