Calculate https://webwork.math.su.se/webwork2_...f7e026e1b1.png. The answer may not contain cyklometriska functions.

got no ide to do this

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- October 2nd 2012, 07:56 AMPetrusarccos+arccot
Calculate https://webwork.math.su.se/webwork2_...f7e026e1b1.png. The answer may not contain cyklometriska functions.

got no ide to do this - October 2nd 2012, 09:14 AMSorobanRe: arccos+arccot
Hello, Petrus!

Quote:

Let

. . Then: .

Let

. . Then: .

We have: .

. .

- October 2nd 2012, 01:18 PMSironRe: arccos+arccot
Let

Now, let's take the of both sides. Thus

If we use the following identities:

then we can write the equation as

- October 2nd 2012, 06:38 PMNervousRe: arccos+arccot
- October 2nd 2012, 08:51 PMPetrusRe: arccos+arccot
Hello soroban!

Idk where u got that formel tan o=tan a+tan b/... Etc

Then i wanna ask how do i see what tan o=-1 ik its writen on My book but on test i cant use My book so plz can some1 tell me? Ik for 30degree,60 and 45 i can make a triangel but how i do with rest!!!