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Step-by-step explanation:
Square on both sides,
=> (cosA + sinA)² = (√2 cosA)²
=> cos²A + sin²A + 2cosA.sinA = 2cos²A
=> 2cosA.sinA = 2cos²A - cos²A - sin²A
=> 2cosA.sinA = cos²A - sin²A
=> 2cosAsinA= (cosA + sinA)(cosA - sinA)
=> 2cosAsinA = (√2 cosA )(cosA - sinA)
=> 2cosAsinA/√2cosA = cosA - sinA
=> √2 sinA = cosA - sinA
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