Question

please answer this question and get 80 points.

Answer 1

in question 2 directly substitute the values of a and b in the equations and you will get the answer!
question-3 also just multiply and then you will get the idea!

hope this helps!

Answer 2

Hola ^_^

JUST SUBSTITUTE THE VAKUES OF A AND B AND THEN VERIFY

FOR 2 ND QUESTION USE IDENTITIES AN D SOLVE !