Calculate cos cos (π /6) using the Pythagorean identity.

Calculate tan tan (3π /4).using the Pythagorean identity. 

Using the Pythagorean identity x + x = 1, find sin sin (2π /3).

Determine cos cos (2π /3) using the Pythagorean identity.

Find sin sin (π /3) using the Pythagorean identity.

Determine tan tan (π /6) using the Pythagorean identity.

Using the Pythagorean identity x + x = 1. find cos cos (5π /6).

Find tan tan (π /3) using the Pythagorean identity. 

Using the Pythagorean identity, find cos cos (π /3). 

Evaluate cos cos (π /4) using the Pythagorean identity.