Anaylytic Trig: Using dbl-angle formulas...

[frauleinedoctor]

Ok well, thank you anyway.


Yes, i know. Its from a quote from the 3rd Indiana Jones movie.

 

[Denis]

Ohh, ok that makes sense, Its all one term/variable.
Ok, I see how this works out then.
Its works out to cos2sin = 7/25.

That SHOULD be COS(2u) = 7/25 ; see why we think your mind is doing tumbling acts? :wink:

Carrying on: 2u = ARCCOS(7/25) ; 2u = ~73.7398 degrees

Now, if you try SIN(u), you'll go SIN(73.7398 / 2) and you'll get 3/5 or .6 as answer ; kapish?

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