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# Optimization: Trig functions Tweet

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1. Optimization: Trig functions
8(sinX)^-2.cosX - 4(cosX)^-2.sinX = 0

is my derivative

How do I solve for X easily?
2. Re: Optimization: Trig functions
(Original post by chrislpp)
8(sinX)^-2.cosX - 4(cosX)^-2.sinX = 0

is my derivative

How do I solve for X easily?

Multiply both sides by , then divide both sides by

You will get Solve it to get the solutions.

Sorry for not replying to your previous thread, i did saw that you quoted me about this question but i was busy so couldn't help.
3. Re: Optimization: Trig functions
Add 4(cosX)^-2.sinX to both sides (to get an equality), get rid of the fractions, divide one side by the other.
4. Re: Optimization: Trig functions
(Original post by raheem94)
.. Solve it to get the solutions.
This is a bit close to a full solution if you ask me...
5. Re: Optimization: Trig functions
(Original post by DFranklin)
This is a bit close to a full solution if you ask me...
I understand it is close to a full solution. Actually he asked me this question on another thread, but i was busy so can't reply neither did anyone else helped him with it, so i thought that he has been stuck on it for a long time now and as no one was helping him so i decided to give him enough detail to finish off the question.

Sorry for it though.
6. Re: Optimization: Trig functions
(Original post by raheem94)
I understand it is close to a full solution. Actually he asked me this question on another thread, but i was busy so can't reply neither did anyone else helped him with it, so i thought that he has been stuck on it for a long time now and as no one was helping him so i decided to give him enough detail to finish off the question.

Sorry for it though.
No worries.