## anonymous one year ago Can I please get help with these problems?.

1. anonymous

2. anonymous

for the first one you can replace $$\sin^2(x)$$ by $$1-\cos^2(x)$$ to get $\cos(x)-(1-\cos^2(x))-1$

3. anonymous

that will get you $\cos^2(x)+\cos(x)-2$which factors

4. anonymous

the second one is easier, since $$z^2-b^2=(a+b)(a-b)$$ you have $\cot^2(x)-1=(\cot(x)+1)(\cot(x)-1)$