Tag Archives: identities

Trigonometry – Sine Double Angle Identity

By | September 20, 2016

Sine Double Angle Identity In this tutorial students learn how to verify a trigonometric equation.  The students will learn to use trigonometric identities like the Double Angle Identity and the Pythagorean Identity. Virginia Standards of Learning (SOL) T.5 Key Skills Pythagorean Identities sin²x + cos²x = 1 1 + cot²x = csc²x tan²x + 1 = sec²x… Read More »

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 – Sine Difference Formula

By | September 17, 2016

Sine Difference Formula In this tutorial learn how to verify a trigonometric equation using trigonometric identities like the sine difference formula. 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) = cos (α)… 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 »