## anonymous 5 years ago whats another way of writing $\cos ^{2}$?

1. anonymous

you can also write it $(\cos(x))^2$

2. anonymous

so i can apply chain rule to it?

3. anonymous

Yep

4. anonymous

hey can I ask you another question?

5. anonymous

fire away

6. anonymous

how do I turn $\sqrt{y}= x^{2}(x+7)$ into y=mx+b form?

7. anonymous

well first I would distribute the $x^2$ into the (x+7) then solve for y by squaring both sides.

8. anonymous

my bad its : $y^{2}= x^{2} (x+7)$

9. anonymous

well then distribute the $x2^$ then take the square root of both sides to solve for y. Remember when taking the square root you might need to account for the result being + or -

10. anonymous

err $x^2$