Question

MATH HELP ! MEDALS WILL BE GIVEN + FAN !

Answer 1

@phi @ganeshie8 @Luis_Rivera

Answer 2

Before doing any real math, you can notice that if cos(theta)=0, then the whole equation will equal 0.

Answer 3

Okay so how do i do this ?

Answer 4

That means two values exist between the boundaries given that make cos(theta)=0

Answer 5

Other than those two values, I don't think anything else would work, because sin(a) and cos(a) can never both be 0.

Answer 6

Okay. what do i do to get my answer because i don't really understand this.

Answer 7

What do you not understand about this problem?

Answer 8

Oh actually nvm, I think there might be more, since cos(theta) can be negative.

Answer 9

This whole problem.

Answer 10

You are trying to find what makes that whole equation equal to 0.

Answer 11

would it be the last one. i just posted

Answer 12

To do this, you can set the two things being added equal to each other:

2sin(theta)cos(theta)=-cos(theta)

Answer 13

The thing about the last one though is that 0 would give you:

0 * 1 + 1=0
Which is not true

Answer 14

okay. so what would be my answer ?

Answer 15

From what I told you before, two answers that need to be included are pi/2 and 3pi/2, so the third choice can be ruled out.

Answer 16

Okay so c is out. is my answer d ?

Answer 17

It's not d, because of what I said earlier:

0 * 1 + 1 = 0
This isn't true.

Answer 18

Ohhh yeah thats right. I meant to say b ?

Answer 19

And 3pi/4 doesn't work either from what I just tested on my calculator, so it must be B.

Answer 20

thats wht i said b

Answer 21

I just wanted to explain my thought process as all.

Answer 22

Thank you very much