# Solve the equation #cos3t=cos2t#?

##### 3 Answers

#### Explanation:

Knowing that,

But, we observe that,

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Solution is

#### Explanation:

We will use here

Hence, we ccan write

or

or

i.e. either

i.e. either

Observe that the latter set (i.e. where

Hence solution is

#### Explanation:

cos 3t = cos 2t

a. 3t = 2t

t = 0 or

b. 3t = - 2t

5t = 0 or

Check by calculator, with k = 1