**Inverse Trigonometric Functions**

1. If , then or is the angle in whose sine is equal to : .

2. If , then or is the angle in whose tangent is equal to : .

3. If , then or is the angle in whose cosine is equal to : .

**Ex 1** Find
and
.

**Sol**
since
and
, and

since and .

**Ex 2** Find
.

**Sol** Let
, so
. From the right
triangle shown below,
, so
.

**Pr A** Find the following, or explain why they are undefined:

a) and b) .

**Pr B** Find the following, or explain why they are undefined:

a) and b) .

**Pr 1** Find a) and b)
.

**Pr 2** Find a)
and b)
.

**Pr 3** Find a) and b)
.

**Pr 4** Find
.

**Pr 5** Find
.

**Pr 6** Find
.

**Pr 7** Find
.

**Pr 8** Find
.

Go to Solutions.

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Lawrence Marx 2002-07-12