大学高等数学
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5. S = (1/2)αR^2
dS/dα = (1/2)R^2
dS/dR = αR
dS = (1/2)R^2dα = (1/2)10*10(-π/360) = -π/7.2 = -0.436
dS = αRdR = (π/3)10*0.1 = (π/3) = 1.407
dS/dα = (1/2)R^2
dS/dR = αR
dS = (1/2)R^2dα = (1/2)10*10(-π/360) = -π/7.2 = -0.436
dS = αRdR = (π/3)10*0.1 = (π/3) = 1.407
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