Can someone please explain how to solve this question:
$f(x)=−3+2\cos(x)$
$g(x)=\cos(x−\pi/4)−2$
Sum of functions: $s(x)=f(x)+g(x) $ Difference of functions: $v(x)=f(x)−g(x)$
Get the sum and difference of functions (both sinusoids), round the answer off to 2 decimal places. We are allowed to use the Ti=84+ (so we can use calc max, calc intersect, etc.)
These are the answers, but can someone please explain how they got them: $s(x)=−5+2.80\cos(x–0.26)$
$v(x)=−1+1.47\sin(x–4.21)$