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A question

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Glockmeister:
Simplify

Collin Li:
What does it mean by simplify? I believe that the LHS should actually equal to for all values of .

Glockmeister:
Argh.. bleh, that = 1 shouldn't be there.

The actual equation is

Collin Li:

--- Quote from: Glockmeister on March 20, 2008, 01:36:40 am ---

--- End quote ---

Let and

Since inverse trigonometric functions represent angles, realise that this is the sum of two angles:







Using triangles, or the trigonometric identity:

, and

AppleXY:
I can prove + = (for x>0) using calculus. But how would you prove - using trig?

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