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October 20, 2014

October 20, 2014

Posted by **Don** on Saturday, December 17, 2011 at 6:50pm.

csc3theta - csctheta + cottheta/csctheta = cotsqtheta + costheta

wow ... try that one

- Trig -
**Steve**, Sunday, December 18, 2011 at 5:32amHere's where parentheses come in handy.

As written, the identity is wrong. What you meant to say was

(csc^3 - csc + cot)/csc

= (csc(csc^2 - 1) + cot)/csc

= (csc cot^2 + cot)/csc

= csc cot^2/csc + cot/csc

= cot^2 + cos/sin * sin

= cot^2 + cos

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