Solve for x; x = 1 - (sinA - cos A)^2
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Step-by-step explanation:
x=1-(sinA-cosA)²
x=1-(sin²A+cos²A-2sinAcosA) [applying (a-b)² formula]
x=1-1-2sinAcosA [sin²A+cos²A=1]
x= -2sinAcosA
∴ x= -sin2A [2sinAcosA=sin2A]
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