- How to verify this trig identity? # 45 and 47?

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f(x, y, λ)=x2+y2−λ(5x+7y−6)
fx=? The circumference of a circle is x square units and the area of the circle is y square units.if x=y, then radius of the circle is :? (a+b)^2 calculate? If blood was a different color, like green or purple, would it still be scary? What would a thousand mph sustained wind do to cities and infrastructure?