Identify the type of trigonometry problem
Draw or interpret the right triangle or unit circle
Label known sides, angles, and unknowns
Choose the appropriate trig ratio
Use sine for opposite over hypotenuse
Use cosine for adjacent over hypotenuse
Use tangent for opposite over adjacent
Substitute the known values into the equation
Solve for the unknown side or angle
Use inverse trig functions to find angles
Check your answer for reasonableness
Simplify fractions, radicals, and decimals as needed
Apply trig identities when required
Use the Pythagorean theorem when needed
Verify units and calculator mode in degrees or radians