Which of the following is not equivalent to cos pi over 5 1. cos negative pi over 5 2. cos 9pi over 5 3. cos 4 pi over 5 4. cos 11 pi over 5

The expression that is not equivalent to is:

                   3.  

We are asked to find which of the expression is not equivalent to:

1)

We know that:

Hence, we get:

Hence, option: 1 is incorrect.

2)

We know that:

As we know that:

Hence, we have:

Hence, option: 2 is incorrect.

4)

We know that:

As we know that:

Hence, we have:

Hence, option: 4 is incorrect.    

3)

We know that:

As we know that:

Hence, we have:

                Hence, option: 3 is the answer.

the answer is here: : )

:

answer: what is the conflict?

step-by-step explanation:

*what has happened to new york city?

*what is in the time capsule?

* what did the kidz see that gave them hope?

*what will they do with what they find?

* how will they save the city?

* what challenges will they face along the way?

*what big choice will they make at the climax of the story?

* what lesson do they learn at the end of the story?