Write the trigonometric expression as an algebraic expression in U

cos(arctan U)

I seriously had this down until my teacher stopped using numbers...

Re: Write the trigonometric expression as an algebraic expression in U

Quote:

Originally Posted by

**Nervous** cos(arctan U)

Let , then .

So what is

Re: Write the trigonometric expression as an algebraic expression in U

Cos(Theta) = cos(arctan(U))

Cos(Tan(theta))= Cos(U)

ArcCos(Tan(theta))=U

Yes?

Re: Write the trigonometric expression as an algebraic expression in U

Quote:

Originally Posted by

**Nervous** Cos(Theta) = cos(arctan(U))

But that doesn't get me anywhere...?

Oh come on. THINK!

If what

Re: Write the trigonometric expression as an algebraic expression in U

Where does 3 come from? And I editted my post since you replied

Re: Write the trigonometric expression as an algebraic expression in U

Quote:

Originally Posted by

**Nervous** Where does 3 come from?

Well, in the OP you complained about not having numbers.

Are you saying that if someone tells you that that you cannot tell us what value has.

If you cannot, then no wonder you don't know how do this question.

Re: Write the trigonometric expression as an algebraic expression in U

Quote:

Originally Posted by

**Nervous** Where does 3 come from? And I editted my post since you replied

Where the 3 comes from is that Plato is giving you a concrete example of the general question to try and guide you to answering the general question. You are meant to realise that.

Answer Plato's question ( ) and then consider how you might use it as a guide to answering

Also, **please don't edit posts after getting replies**. For obvious reasons it just creates confusion.