Ex. Solve. 2sinx-1=0 *solve for trig expression.
2sinx=1 *solve for x
sinx=1/2
To Graph: Find the quadrants in which sine is positive.
Apply appropriate triangles and label.
Find reference angles.
x=Ï€/6, 5Ï€/6
Ex. Solve. 3tan²x-1=0
tan²x=1/3
tan²x=1/√3 and - 1/√3 <----- when it is plus or minus the answers are in all 4 quadrants
X= π/6, 5π/6, 7π/6, and 11π/6
Ex. Solve. 2sin²x-sinx-1=o <--------- The same as factoring a quadratic. This equation is the same as 2x²-x-1.
(2sinx+1) (sinx-1)=0
2sinx+1=0 sin-1=0
sinx=1, and -1/2 <--------- When they equal 1, -1, or 0 you have to plot the point
x= 7π/6, 11π/6, and π/2
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