# Re: Quick Question

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Posted by Soroban on September 25, 2002 at 19:06:50:

In Reply to: Re: Quick Question posted by Liz on September 25, 2002 at 18:16:46:

: : Where did you find such a problem? These are impossible because for all values of x:
: : -1 <= sin x <= 1
: : -1 <= cos x <= 1

Liz, this is true! Can you "read" what it says?
sin x and cos x are ALWAYS between -1 and +1.
Get it? They can NEVER be 1.364 or 2.456

So, these are "trick questions" ~ ALL OF THEM!

: 7) sin x = 1.364    x=________
: 8) cos x = 2.456    x=________

"Find the angle whose sine is 1.364, or whose cosine is 2.456 ?"
There are no such angles!

: Write all the angle values:
: 8) arccos 1.45123 = _________

This asks "what angle has a cosine of 1.45123?"

Try it on your calculator. First, you must find the "key" that says [COS^-1].
Press [SHIFT] then [COS], then enter 1.45123 ~ and ask for the answer.
You will get an ERROR ~ meaning "Impossible!"

: Oh well, I'll just try to reason with the retard tomorrow morning for her to explain it to me. You have no idea how much this woman aggravates me!!

: And the place where I got these problems was from her very own worksheets that she made like 90 million years ago when she first started teaching.

There is a valuable lesson to be learned from ONE such problem.
But I don't see a need for three or more of the same type ~
or an entire worksheet of them.

Trick question: What is the area of the triangle with sides 2, 4, and 10?
Never mind the formulas ~ look at the problem. There is NO triangle!
(With sides 2,4,10, the figure won't "close".)

So, a lesson was learned there ~ but I wouldn't give you THREE MORE like it.

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