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Angle Difference FormulaHow to use formula to express exact values The angle difference 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 cos(15°). Unlike the cos(60°) which can be expressed as ½, the cos(15°) cannot simply be represented as a rational expression. However, the angle difference formula allows you to reprsent the exact value of this function
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