

Angle Sum FormulaHow to use formula to express exact values The angle sum identities take two different formulas
These formulas allow you to express the exact value of trigonometric expressions that you could not otherwise express. Consider the sin(105°). Unlike the sin(30) which can be expressed as ½, the sin(105) cannot simply be represented as a rational expression. However, the angle sum formula allows you to represent the exact value of this function
USe the angle sum formula to determine the exact value of cos(75°)
USe the angle sum formula to determine the exact value of sin(75°)
USe the angle sum formula to determine the exact value of cos(105°)
