Siddhartha112 Siddhartha112

31-05-2022
Mathematics

contestada

(COSA-SINA)²=
1-2sinA. COSA

Respuesta :

jimrgrant1 jimrgrant1

31-05-2022

Answer:

see explanation

Step-by-step explanation:

using the identity

sin²x + cos²x = 1

consider left side

(cosA - sinA)²

= (cosA - sinA)(cosA - sinA) ← expand using FOIL

= cos²A - sinAcosA - sinAcosA + sin²A

= cos²A + sin²A - 2sinAcosA

= 1 - 2sinAcosA

= right side

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