① ∫▒cos2x/(cos^2 x)dx
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① ∫▒cos2x/(cos^2 x)dx
① ∫▒cos2x/(cos^2 x)dx
① ∫▒cos2x/(cos^2 x)dx
原式=∫[2(cosx)^2-1]dx/(cosx)^2
=∫[2-(secx)^2]dx
=2x-tanx+C.
2x-tanx