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25-04-2024
Mathematics

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(cosA+Sina) ^2 + (cosa-Sina)^2

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Itz5151 Itz5151

25-04-2024

Step-by-step explanation:

(cosA+SinA) ^2 + (cosA-SinA)^2

(a+b)² = a²+b²+2ab and (a-b)² = a²+b²-2ab

cos²A+2sinA*cosA + sin²A + cos²+sin²-2sinA*cosA

cos²A+sin²A = 1

1+1 = 2

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