Lesson: Evaluating Trigonometric Functions Using Pythagorean Identities | Nagwa Lesson: Evaluating Trigonometric Functions Using Pythagorean Identities | Nagwa

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Lesson: Evaluating Trigonometric Functions Using Pythagorean Identities Mathematics • First Year of Secondary School

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In this lesson, we will learn how to use the Pythagorean identities to find the values of trigonometric functions.

Lesson Plan

Students will be able to

  • recognize and recall the Pythagorean identities for the trigonometric functions sincostanseccotcsc𝜃+𝜃=1,1+𝜃=𝜃,1+𝜃=𝜃;
  • understand how to find the value of a trigonometric ratio given the value of another, using the Pythagorean identities, in each of the four quadrants;
  • use the Pythagorean identities in combination with other identities to simplify and evaluate trigonometric expressions.

Lesson Presentation

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