# Tag Archives: cosine

## Trigonometry – Cosine Double Angle Identity

By | September 18, 2016

Cosine Double Angle Identity In this tutorial students learn how to verify a trigonometric equation using trigonometric identities like Double Angle and Pythagorean. Virginia Standards of Learning (SOL) T.5 Key Skills Pythagorean Identities sin²x + cos²x = 1 1 + cot²x = csc²x tan²x + 1 = sec²x Trigonometric Identities 1/cos(x) = sec(x) 1/sin(x) = csc(x) tan(x)… Read More »

## Trigonometry – Cosine Difference Formula

By | September 16, 2016

Cosine Difference Formula In this tutorial students learn how to verify a trigonometric equation using trigonometric identities like the difference formula for 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) sin (β) cos (α – β) =… 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 »

## Math Analysis – Solve Cosine Trigonometric Equation over the interval [0,2pi)

By | September 14, 2016

Cosine Trigonometric Equation over an interval In this tutorial the student will learn how to solve a trigonometric equation over a specified interval, [0,2pi). The students will also verify the solutions using the GRAPH, TABLE, WINDOW and ZOOM features of the TI-84C. Virginia Standards of Learning(SOL) T.8 1) Simplify and/or factor the equation if necessary. 2) Get the… Read More »