Since the radius is 12, the equation is
.. x^2 +y^2 = 144
If sinα=1/4 and it is in q2 it means that the x coordinate is negative.
The triangle has a height of one and a hypotenuse of 4 so:
x=-√(4^2-1)
x=-√15
so tanα=-1/√15
tanα=-√(1/15)
tanα≈ -0.258
It would be 2u3+4u2-2u-4u2-8u+4= 2u3-10u+4
