# Tag Archives: sum and difference formula

## Trigonometry – Sum and Difference formulas of sine and cosine – Example 2

By | September 23, 2016

Sum and Difference formulas of Sine and Cosine In this tutorial the students will learn how to use the sum and difference formulas for unknown angles. The students will be given the quadrants and the result of the specified trigonometric functions.  The student will then construct the needed triangles to solve the question. Key Points of… Read More »

## Trigonometry – Sum and Difference Formulas for Sine and Cosine for unknown angles

By | September 22, 2016

Sum and Difference Formulas In this tutorial the students will learn how to use the sum and difference formulas for unknown angles. The students will be given the quadrants and the result of the specified trigonometric functions.  The student will then construct the needed triangles to solve the question. Key Points of Knowledge Sum and Difference… Read More »

## Trigonometry – Sum and Difference Formulas of Sine and Cosine

By | September 15, 2016

Sum and Difference Formulas of Sine and Cosine In this tutorial student learn how to verify a trigonometric equation using trigonometric identities like the difference formula for sine and cosine. Virginia Standards of Learning (SOL) T.5 Key Points of Knowledge Sum and Difference Formulas cos (α + β) = cos (α) cos (β) – sin (α)… Read More »