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7). I = ∫(1/2)sin2xdx/{[(sinx)^2+(cosx)^2]^2-2(sinx)^2(cosx)^2}
= ∫(1/2)sin2xdx/[1-(1/2)(sin2x)^2] = ∫sin2xdx/[2-(sin2x)^2]
= -(1/2)∫dcos2x/[1+(cos2x)^2] = -(1/2)arctan(cos2x) + C
= ∫(1/2)sin2xdx/[1-(1/2)(sin2x)^2] = ∫sin2xdx/[2-(sin2x)^2]
= -(1/2)∫dcos2x/[1+(cos2x)^2] = -(1/2)arctan(cos2x) + C
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