Question

Hi my question asks

Use a calculator to solve each equation on the interval 0 11 years ago

Answer 1

how about you write sec(theta) in terms of cos first since the cos function is on your calc and sec isn't

Answer 2

i did.

Answer 3

I have to input the inverse of costheta(-4) but i get a domain error when i do it as a fraction. How do i remove fraction from

1/costheta=-4

into

cosinverse theta = -4?

Answer 4

so that means you have
\[\frac{1}{\cos(\theta)}=-4 \]
you need to first flip both sides
then you can take arccos() of both sides

Answer 5

are you want to cross multiply you can
i will rewrite it for you in a sec
\[\frac{1}{\cos(\theta)}=\frac{-4}{1}\]
But I would just flip both sides (faster)

Answer 6

flip both sides you get
\[\cos(\theta)=\frac{-1}{4}\]
be careful when you use arccos( ) on both sides
it will only give you one number between 0 and 2pi
there is actually one more x that occurs in that interval that satisfies cos(theta)=-1/4