Which trigonometric expression does not simplify to 1?
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- NY,NY

Which trigonometric expression does not simplify to 1?
(see link)

- chestercat

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- NY,NY

http://puu.sh/iumN8/7819dc2e72.png

- Vocaloid

well, let's try each answer one by one and see what we get, shall we?

- NY,NY

ok.

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## More answers

- Vocaloid

|dw:1434685599699:dw|

- anonymous

help me please my question is at the top of the feed

- Vocaloid

does that make sense?

- NY,NY

I dont understand how cos^2/sin^2 became just cos^2.

- Vocaloid

I distributed sin^2(x)

- Vocaloid

|dw:1434685846593:dw|

- Vocaloid

see how sin^2(x) cancels out?

- Vocaloid

|dw:1434685945486:dw|

- Vocaloid

|dw:1434685962311:dw|

- NY,NY

Oh yes that makes more sense.

- NY,NY

Thank you for explaining that.

- Vocaloid

ok, so we know that #1 is not the right answer because we get 1 in the end

- Vocaloid

let's move on to number 2

- NY,NY

Ok.

- Vocaloid

|dw:1434686053840:dw|

- Vocaloid

|dw:1434686204867:dw|

- Vocaloid

does this make sense so far?

- NY,NY

yes, because you used the Pythagorean identity at the end, right?

- Vocaloid

yup! ok, we know that #2 is out, because we ended up with 1, so let's move on to #3

- NY,NY

Right.

- Vocaloid

|dw:1434686335785:dw|

- Vocaloid

now, I believe #3 is the right answer, but let's check #4 just in case

- Vocaloid

|dw:1434686426089:dw|

- Vocaloid

|dw:1434686523673:dw|

- Vocaloid

whew, that took a while, but do you understand everything so far? :)

- Vocaloid

the important thing to remember, is that when you have csc, sec, cot, or tan, you can re-write them in terms of cos or sin, which usually helps you cross things out and simplify :)

- NY,NY

Im a little confused with the second step you took.

- Vocaloid

which one? #3 or #4?

- NY,NY

#4.

- Vocaloid

can you tell me exactly which part is confusing?

- NY,NY

the step that the arrow is pointing to
|dw:1434687552340:dw|

- NY,NY

Im confused how that concluded from the previous step, where you substituted the reciprocals.

- Vocaloid

|dw:1434687726888:dw|

- Vocaloid

which leaves me with|dw:1434687748727:dw|

- Vocaloid

does it make it more clear? or is there something you're still unsure about?

- NY,NY

Ok, yes that makes sense.

- NY,NY

So that leaves us with choice 3.

- Vocaloid

yup ~

- NY,NY

Ok, thank you for helping.

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