Sin(x)^2 = cos(x/2)^2

First of all, you can use

and the equation becomes

Now, from the known identity

we can half all the angles and we get

So, the equation has become

So, everything comes down to solve

The associated equation

has roots

So, we want one of the following

Solve for the associated angles and you're done

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

l.ln.lln.k.nkl

step-by-step explanation: