pls help me with this question, been working on it for quite some time but still can't figure it out:

Given cosecA+cotA=3, evaluate cosecA-cotA and cosA.

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- August 4th 2007, 08:08 PMwadevalatrigo indentity
pls help me with this question, been working on it for quite some time but still can't figure it out:

Given cosecA+cotA=3, evaluate cosecA-cotA and cosA. - August 4th 2007, 08:35 PMThePerfectHacker

Thus,

Square,

Thus,

Solve for,

. - August 4th 2007, 08:44 PMTKHunny

I suspect it's cleaner if you remember relationships between the cosecant and cotangent, but I never do. I always have to look them up.

Okay, you do cos(A). - August 4th 2007, 10:45 PMSoroban
Hello, wadevala!

Quote:

Given: . , .evaluate: .

Note that: .

Multiply by

. .

Therefore: .

Quote:

Evaluate:

We have: .

Square: .

. . which simplifies to: .

and we have: .

- August 5th 2007, 07:19 AMwadevala
thx for the different ways of going about solving the qns, i understand it much better now :)