Hi guys! This video discusses the product-to-sum and sum-to-product of angles identities for trigonometric functions. We will apply the formula for them to evaluate trigonometric functions of special angles without using calculators. Happy learning and enjoy watching! #enginerdmath #trigonometry #producttosumandsumtoproductofanglesidentities Like FB Page: @enginerdmath Follow Instagram: @enginerdmath BASIC MATH PLAYLIST •Grade7-Math(Basics) ALGEBRA PLAYLIST •Algebra Join this channel to get access to perks: /@enginerdmath