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Having sequence like $ \beta_1 \cos\theta_1 + \beta_2 \cos\theta_2 + \beta_3 \cos\theta_3 + \dots + \beta_n \cos\theta_n$ it is possible to present it using summation notation as follows:

$ \sum_{i=1}^n \beta_i \cos\theta_i $

But is it correct to present a sequence like

$ \beta_1 \cos\theta_1 + \beta_2 \cos\theta_2 - \beta_3 \cos\theta_3 \pm \dots \pm \beta_n \cos\theta_n$ as summation when a particular elements may need to be used with a negative sign?

Update 1

Unfortunately there is no any pattern for + and -. The sign is deduced by manually interpreting the contour of a polygon.

Update 2

Also, Is it correct for integration notation?

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    Is *what* correct for integration notation? You haven't given any integration notation.2012-03-03

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