∫tan^2xdx=∫(sec^2x-1)dx

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∫tan^2xdx=∫(sec^2x-1)dx∫tan^2xdx=∫(sec^2x-1)dx∫tan^2xdx=∫(sec^2x-1)dx∫tan^2xdx=∫(sec^2x-1)dx=∫sec^2x

∫tan^2xdx=∫(sec^2x-1)dx
∫tan^2xdx=∫(sec^2x-1)dx

∫tan^2xdx=∫(sec^2x-1)dx
∫tan^2xdx=∫(sec^2x-1)dx=∫sec^2xdx-∫1dx=tanx-t+C