February 13 th copyright2009merrydavidson. Inverse functions switch the x and y values. The inverse is NOT a function. y = arcsin x y = sin -1 x 4.7Inverse.

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Presentation transcript:

February 13 th copyright2009merrydavidson

Inverse functions switch the x and y values. The inverse is NOT a function. y = arcsin x y = sin -1 x 4.7Inverse Trig Graphs

Cosine y = arccos x y = cos -1 x The inverse is NOT a function.

Tangent y = arctan x y = tan -1 x The inverse is NOT a function.

The sine of 30 0 is what? 4.7Inverse Trig Functions 1/2 Let’s go backwards. What angle has a sine of ½? When you are finding the angle you are using inverse trig functions or arc trig functions. What about co-terminal angles? ( )+360n 30 0, 150 0

Find the angle in degrees whose sine is: STEPS: Determine the quadrants (All Students Take Classes). Find the angle(s). Add on the tag. QI,II n n QI,II n n This is how we write the problem.

At what angle is the sine equal to 2? Never, because the range for sine is [-1,1].

Find the angle in degree measure QI,IV n n QIII,IV n n

Find the angle in radian measure Quadrantal angleQ I,IV Q II,IV Use the correct period!

HW: WS 8-3