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[tex]\sum_{1}^{n} \tan(a f_{n} ) [/tex]

[tex]\cos x = 1 - {x^2 \over 2!} + {x^4 \over 4!} - \cdots[/tex]

[tex]\sin\left( x \right) = x - \frac{x^3}{3!} + \frac{x^5}{5!} - \frac{x^7}{7!} + \cdots[/tex]

[tex] \tan(x) = \sin(x) / \cos(x)[/tex]

There might be equations for the summation of a series of sine functions or an equation for the summation of a series of consine functions. I don't know what they are. I have no idea how to go about deriving this.

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# Homework Help: Summation of Tan functions

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