## anonymous 3 years ago Trig identity help?

1. anonymous

$\frac{{ - 6{{\left( {\cos \left( t \right)} \right)}^2} \cdot \sin \left( t \right)}}{{6{{\left( {\sin \left( t \right)} \right)}^2} \cdot \cos \left( t \right)}} =- \cot(t)$

2. hartnn

just cancel, 6,sint and cos t, from numerator and denominator,what remains ?

3. klimenkov

Can you simplify fractions?

4. anonymous

oh man...

5. anonymous

how did I not see that... embarrassing.. thanks for the help

6. hartnn

welcome ^_^

7. anonymous

hey @hartnn, when taking second derivatives of parametric curves, we use a formula like:|dw:1351710488694:dw| I am allowed to just take the derivative of -cot(t) or do I have to use y dot and x dot??

8. klimenkov

Can you write what you want from the very beginning?

9. hartnn

i'll need entire question to answer that.....

10. anonymous

i'll post a new question and tag you fella's