# Sum and difference formulas calculator

Add a percentage P to the value V. To add percentages the formula is: V+((P/100)*V). For example: add 25% to 280. From

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## Cosine, sin and tangent of sum and difference of angles

Instead of using a calculator, use Microsoft Excel to perform the The simplest way to add a summation formula to the spreadsheet is

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The restriction does not take away from the generality of the formula as we can always reduce the angles of the Calculate the sine of 75ยบ without using the calculator.

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