Khan Academy

Trig challenge problem: cosine of angle-sum (K-A)

Trig challenge problem: maximum value (K-A)

Proof of the cosine angle addition identity-video (K-A)

Trig challenge problem: multiple constraints (K-A)

Proof of the sine angle addition identity-video (K-A)

Trig challenge problem: system of equations (K-A)

Review of trig angle addition identities-video (K-A)

Using the cosine angle addition identity-video (K-A)

Using the cosine double-angle identity-video (K-A)

Solving cos(θ)=1 and cos(θ)=-1-video (K-A)

Solving sinusoidal equations of the form sin(x)=d-video (K-A)

Trig word problem: solving for temperature-video (K-A)

Trigonometric equations review-link (K-A)

Domain & range of inverse tangent function-video (K-A)

Intro to arccosine-video (K-A)

Intro to arcsine-video (K-A)

Intro to arctangent-video (K-A)

Inverse trigonometric functions review-link (K-A)

Restricting domains of functions to make them invertible-video (K-A)

Using inverse trig functions with a calculator-video (K-A)

Finding trig values using angle addition identities-video (K-A)

Trig identity reference-link (K-A)

Using trig angle addition identities: finding side lengths-video (K-A)

Using trig angle addition identities: manipulating expressions-video (K-A)

Using trigonometric identities-video (K-A)