Simple trig (?) (1 Viewer)

[Pyrobooby]

How can we show tan^-1 (2) - tan^-1 (1) = tan^-1 (1/3)?

 

[taeyang]

You can't, it's impossible.

 

[thoth1]

you take tan of both sides

 

[muzeikchun852]

this isn't a 4u question.

let A = tan^-1 2 and B = tan^-1 1
expand tan (A - B) and sub in the value.

 

[ohexploitable]

you take tan of both sides

dis

 

[thoth1]

then on the LHS u use compound angle.

 

[thoth1]

You can't, it's impossible.

m8 u wuldnt hav really cum across this. this is used a lot in 4U questions.

 

[Pyrobooby]

Saw it in mechanics so yeah. Sorry about that.

Thanks muzeik