its finding surface area of a polar graph
the equation is
r^2 = cos 2 theta, around the x-axis
thanks
2 ∫{0→π/4} 2π(rsinθ)√(r² + (dr/dθ)²) dθ
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2 ∫{0→π/4} 2π(rsinθ)√(r² + (dr/dθ)²) dθ