Using trig angle addition identities: finding side lengths

Sal is given a drawing with two triangles and some side lengths, and he uses the sine angle addition identity in order to find a missing side length.

Using trigonometric identities

Sal rewrites various trigonometric expressions using the Pythagorean identity and other trig identities.

Current time: 0:00Total duration: 6:12

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# Using trig angle addition identities: manipulating expressions

Sal is given that cos(2θ)=C and he uses the cosine double-angle identity in order to find an expression for sin(θ). Created by Sal Khan.