Math, asked by annie1024, 1 year ago

solve this in notebook guys

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Answered by Anonymous

1

Step-by-step explanation:

(cosA - sinA)^2 = 2sin^2A.

→cos^2A + sin^2A -2sinAcosA = 2sin^2A

→cos^2A = 2sin^2A -sin^2A -2sinAcosA

→cos^2A + cos^2A = sin^2A +cos^2A -

+2sinAcosA

→2cos^2A =(sinA+cosA)

→(sinA+cosA). =√2cosA

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