Question

6cos^2 theta + 5 cos theta -4 = 0

Answer 1

u can factorise it

\[(2\cos \theta -1)(3\cos \theta+4)=0\]

Answer 2

to find the exact solution set?

Answer 3

so u will get
\[\theta= \cos^{-1} (1/2) \]
and
\[\theta = \cos^{-1} (-4/3)\]

Answer 4

but how is this done?

Answer 5

after factorised. note that
2(cos theta )-1=0 and 3(cos theta) +4=0

rearrange them and solve both equations to get theta.

Answer 6

ahh, i get it. thanks(:

Answer 7

no prob