Introduction to Trigonometric Ratios (Sin/ Cos/ Tan)By CREATA CLASSES / April 17, 2022 Back to: TRIGONOMETRY 1 USING ANIMATION & VISUAL TOOLS Previous Lesson Introduction To Trigonometry Lesson 1 within section INTRODUCTION TO TRIGONOMETRY. Next Lesson Trigonometric Ratios of 30 & 60 Degree Lesson 2 within section TRIGONOMETRIC RATIOS & FUNCTIONS. You must enroll in this course to access course content.