Hi, can somebody please explain to me how to find the pythagreon identities and quadnrant signs because I'm really confused, and can you please do some of these problems as example because I have a test on this soon and I really need some help. I've tried asking my teacher but I didn't understand when he explained so tysm! Also will give brainliest if you answer all the example problems! tysm!! example instructions: evaluate the expression given sin u= 2/3 with 0<u<pi/2 and cos v=-2/7 with pi<v<3pi/2

example problem no. 1: cos (v-u)

ex. 2: sin (v-u)

ex. 3: cos (u-v)

ex. 4: sin (u-v) ​