# How do you solve #7^2=11^2+9^2-2(11)(9)cosB#?

##### 1 Answer

Nov 26, 2016

#### Answer:

#### Explanation:

Simplifying each term in

we get

or

or

and

and using tables or scientific calculator

Nov 26, 2016

Simplifying each term in

we get

or

or

and

and using tables or scientific calculator

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