# How do you solve #2cot^4x-cot^2x-15=0#?

##### 2 Answers

#### Explanation:

Call

There are 2 real roots:

By definition:

Trig table and unit circle give -->

a.

b.

Substitution

#### Explanation:

Let

Feb 24, 2017

Call

There are 2 real roots:

By definition:

Trig table and unit circle give -->

a.

b.

Feb 24, 2017

Substitution

Let