Theta has a reference angle of 30° and is in Quadrant I or II.
Sin(theta) = ½
Basic angle: 30
<h3>What is the reference angle?</h3>
The acute angle between the terminal arm/terminal side and the x-axis. The reference angle is always positive. In other words, the reference angle is an angle sandwiched between the terminal side and the x-axis.
x^2 - 13x +36 = 0 figure out the factor (x-4)(x-9) = 0 so (x-4) or (x-9) equals 0 so solution is x-4=0 add 4 to both sides and get x = 4 x-9=0 add 9 to both sides and get x=9 x={ 4, 9}
