Explains how to deal with the trig ratios of angles above 90. By using the unit circle the sign of the trig ratios in all quadrants are obtained.

Explains the idea behind the use of the substitution techniques and the relationship with the composition of functions.

Explains how to deal with the trig ratios of angles above 90. By using the unit circle the sign of the trig ratios in all quadrants are obtained. Second part

Define the main trigonometric ratios: sine, cosine and tangent

Applies the substitution for the integral of an exponential of the form e^x

Applies the substitution two examples one involving the integral of sin and another one involving the integral of cos.

Example of the solution of right-angled triangles using trigonometric ratios.

Applies the substitution for the integral of an exponential of the form a^x.