Answer:
y=x-9
Step-by-step explanation:
A^2 - b^2 = (a - b)( a +b);
<span>cos^4x-sin^4x =( cos^2x + sin^2x )( cos^2x - sin^2x) = 1* cos2x = co2x.</span>


Let us rewrite the expression so that the like terms are next to each other.

Combine the coefficients.



Answers A and C I think that’s correct
Answer:
2
Step-by-step explanation:
8 + 6 - 12 = 2