Cosec

solve cosec²?+1=3cot?

This is what i have got so far?

I think I have done it wrong. More in a moment

The values that are given in the book are : 20.9, 69.1, 201, 249?

cosec²θ+1=3cotθ

and since cosec²θ = 1+cot²θ

so 1+cot²θ +1=3cotθ
now let cotθ=c
c²-3c+2=0
(c-2)(c-1)=0

Aitch

Oh thanks. I actually have another Q: cotθ=1-cosec²θ, 0«θ«2π

Oh thanks. I actually have another Q: cot?=1-cosec²?, 0«?«2?

Here is my solution to the question that has already been answered.
( In case ppl are confused the original question was sent to me as a PM but I could not upload to image... so had to post)

But you've worked out: 1 + cot²? = cosec²?

turtle wanted to work out cot? = 1-cosec?²

I think ...

But you've worked out: 1 + cot²? = cosec²?

turtle wanted to work out cot? = 1-cosec?²

I think ...

Ricki on my computer theta does not appear in my messages but it does appear in yours. The theta disappears to be replaced by a question mark in the quoted part.... even if a type nothing.

Do you know how to correct this. I use the option Enhanced Mode...and not Guided Mode. I have experimented in the past but ....

well, I think you need to download javascript.

I'm using the guided mode, the default. I've experienced this problem before, I'm not sure how it is corrected though ...
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I've got the javascript.

cos? I have just typed cos theta using Guided Mode. To get theta I clicked on theta in the menu . I am now doing pi ?

It can be that your browser does not support the use of these symbols.

Or .. you need to download Java ... from ... http://java.sun.com/j2se/1.4.2/download.html

But, how come I can see your symbols but not the ones I produce. Question: In my last post there should be a symbol for theta .... can you see the symbol or do you see a question mark

f) (secθ-cosθ )²=tanθ-sin²θ , 0«θ«π