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Inverse Sine, , arcsine (x)
• Function is increasing• Takes on full range of values• Function is 1-1• Domain: • Range:
(x)Sin -1
2 ,
2
1 1,
Inverse Cosine Function
• What can we restrict the domain of the cosine curve to so that it is 1-1?
1
-1
, 0
Inverse Cosine, , arcCos (x)
• Function is increasing• Takes on full range of values• Function is 1-1• Domain: • Range:
(x)Cos-1
2 ,
2
1 , 1
So far we have:
1) Restricted the domain of trig functions to find their inverse
2) Evaluated inverse trig functions for exact values
3) Found missing coordinates on the graphs of inverses
4) Found the exact values of compositions
Composition of Functions
1) Evaluate innermost function first2) Substitute in that value3) Evaluate outermost function
x ) (x) (f f and x ) (x)(f fhat Remember t -1-1 function necessasry theofdomain in the is x as long As
Sin (arcCos )2
1
Evaluate the innermost function first:arcCos ½ =
Substitute that value in original problem
3Sin
13
5 CosTan 1-
How do we evaluate this?
Let θ equal what is in parentheses
Use the triangle to answer the question
Tan
θ5
13 12
12
5Tan
0.2 SinSin -1
What is different about this problem?
Is 0.2 in the domain of the arcSin?
2.00.2 SinSinThen -1
3
4Sin Sin 1-
What is different about this problem?
3
4Sin evaluatemust wenot, isit Since
function?Sin theofdomain in the 3
4 Is