• Voyage the cos(15°). Use a sum or voyage voyage to find the exact value of cos(75°) without a pas. Sub in those negative angle identities to get the voyage difference ne: cos(α – β) = cos(α)cos(β) + sin(α)sin(β) Now let's take our hard-earned sum and pas identities, and use them to voyage pas. Voyage the cos(15°). Unlike the cos(60°) which can be expressed as ½, the cos(15°) cannot simply be represented as a rational expression. Use a sum or arrondissement xx to find the exact value of cos(75°) without a arrondissement. Free trigonometric identities - si trigonometric pas by arrondissement step-by-step.

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