4sin^2 = cos x + 3
4(1-cos^2) = cos + 3
-4cos^2 -cos x +1
4cos^2 + cos x - 1
I was thinking of using quadratic formula as I tried to factor
Product -4
Sum 1
or
cos x (4 cos x + 1) -1 *I don't know what to do since it is = to -cos x / cos x
4sin^2 = cos x + 3
4(1-cos^2) = cos + 3
-4cos^2 -cos x +1
4cos^2 + cos x - 1
I was thinking of using quadratic formula as I tried to factor
Product -4
Sum 1
or
cos x (4 cos x + 1) -1 *I don't know what to do since it is = to -cos x / cos x
This is not an identity, it is an equation. And you didn't even consistently put in the argument of the functions! "cos " is meaningless in this situation without the argument.
Now, , so we have
Now let :
The quadratic formula says that
Thus
So
You can do both of them on your calculator. I leave the rest to you.
-Dan