Khan Academy: Trig Challenge Problem: Multiple Constraints

Sal is given a diagram with multiple right triangles and is asked to match different expressions with different trig values.

Sal is given a diagram with multiple right triangles and is asked to verify identities relating to trig ratios in those triangles.

Sal solves a very complicated algebraic trig problem that appeared as problem 48 in the 2010 IIT JEE Paper I exam.

Sal solves a very complicated algebraic trig problem that appeared as problem 29 in the 2010 IIT JEE Paper I exam.

Sal solves a word problem about the distance between stars using the law of cosines.

Sal solves a problem about a submerged pyramid using the fact that the sine of an angle is equal to the cosine of its complementary angle.

This video demonstrates how to solve a mixture problem by using a table and solving an equation. [4:07]

This video demonstrates how to solve a mixture problem by setting up and solving a system of equations. [6:43]

A video that demonstrates how to write and solve equations for several different types of algebraic word problems. This is another percent example. This video is also found in the strand Algebra: ck12.org. [11:06]

This video works through examples on how to convert a fraction to a percent and a percent to a fraction. Then, it applies this knowledge by demonstrating how to solve algebraic percent problems. Practice problems available. This video is...