1. ## Limits of trig

can someone explain to me why this is so? its not clicking yet

I know tan = sin/cos

the derivative of sin = cos

the derivative of cos = -sin

I just don't know how to piece all of this together

Thanks

2. anyone?

3. It is just a matter of fairly simple algebra.
There are no derivatives there.

4. Originally Posted by Plato
It is just a matter of fairly simple algebra.
There are no derivatives there.
well that makes me feel even worse because I don't even know where to start

Edit:

where does the multiplication of 2cos on top and cos on bottom come from?

5. Originally Posted by silencecloak
well that makes me feel even worse because I don't even know where to start

they factored out the 2, turned tan into sin/cos and multiplied by a factor of one.

that factor of one they used is cos/cos.

should be easy peezy lemon squeezy after that.

6. Originally Posted by silencecloak
well that makes me feel even worse because I don't even know where to start

Edit:

where does the multiplication of 2cos on top and cos on bottom come from?
they use it as a factor to reduce the equation further.

7. Originally Posted by p00ndawg
they factored out the 2, turned tan into sin/cos and multiplied by a factor of one.

that factor of one they used is cos/cos.

should be easy peezy lemon squeezy after that.
Thanks, I feel pretty dumb lol. Just got to get used to looking at those problems the same way I do with regular numbered problems.