Answer:

Step-by-step explanation:
a) 
b) 
c) 
d) 
e) 
f) 
180/2=90 degree
180/3=60 degree
180/4=45 degree
5/17 × 3/8 = 15/ = 15/136
Use the difference of 2 squares (a - b)(a + b) = a^2 - b^2:-
(x - 1/x)(x + 1/x) = x^2 - (1/x)^2
= x^2 - 1/x^2
(x ^2 - 1/x^2)(x^2 + 1 /x^2)
= x^4 - 1/x^4
(x^4 - 1/x^4)(x^4 + 1/x^4)
= x^8 - 1 /x^8 Answer
Answer:
Hope this helps. Let me know if it doesn't and I'll try to help out. :)