∫sin^2 xdx=?
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∫sin^2xdx=?∫sin^2xdx=?∫sin^2xdx=?∫sin^2xdx=∫(1-cos2x)/2dx=∫1/2dx-∫cos2x/2dx=x/2-1/4∫cos2xd(2x)=x/2-s
∫sin^2 xdx=?
∫sin^2 xdx=?
∫sin^2 xdx=?
∫sin^2 xdx
=∫(1-cos2x)/2dx
=∫1/2dx-∫cos2x/2dx
=x/2-1/4∫cos2xd(2x)
=x/2-sin2x/4+C(C是常数)
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