Status Title Difficulty
1973. Parametric Curve Length Level 3
1974. Roots of Unity in Polynomial Level 2
1975. Trigonometric Expression Simplification 4 Level 2
1976. Cosine Equation Solutions 2 Level 3
1977. Trigonometric Function Transformation Level 5
1978. Theta Cosine Sum Evaluation Level 5
1979. Infinite Cosine Series Evaluation Level 5
1980. Matrix Series Determinant Sum Level 5
1981. Dot Product of Vectors Level 1
1982. Trigonometric Identity Challenge Level 5
1983. Matrix Addition and Multiplication Level 2
1984. Complex Number Series Sum Level 5
1985. Sum of Cosine Values Level 4
1986. Trigonometric Expression Simplification 5 Level 3
1987. Secant and Tangent Relationship Level 2
1988. Line Equation From Parameterization Level 2
1989. Vector Dot Product Calculation Level 2
1990. Cosine of Angle Difference Level 3
1991. Trigonometric Equation Triple Level 5
1992. Real Number Trigonometric Solutions Level 4