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>
13)
Relative max on (2)
Relative min on (-2)
Answer:
I'm unsure about the first one, but the second one is irrational, the third one is option C, the fourth is option b, and the last one is D i believe
Step-by-step explanation:
Answer:
-18
Step-by-step explanation:
-15+6=-9
the absolute value of -9 is 9
and 9*-2=-18
