Calc1.5

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\int {\tan ^{2}(x)\,dx}\,

Substitute \tan ^{2}(x)=\sec ^{2}(x)-1\,

\int \tan ^{2}(x)\,dx=\int \sec ^{2}(x)-1\,dx=\int \sec ^{2}(x)\,dx-\int 1\,dx=\tan(x)-x+c\,

Calculus

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