Help with a simple math problem
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Help with a simple math problem

[From: ] [author: ] [Date: 13-08-11] [Hit: ]
-No. Ill go through it and I am guessing its the clean up at the end where have problems.=2-Just multiply...There is a property.......
It says to simplify each trigonometric expression by following the indicated direction. The original problem is (sinx+cosx)(sinx+cosx)-1 divided by sixcosx. For the answer I got 3. Is this correct?

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No. I'll go through it and I am guessing its' the clean up at the end where have problems.

I believe you started with this:
[ (sinx+cosx)(sinx+cosx)-1 ]/( sinx cosx)
=[(sin^2x + 2sinx cosx + cos^2x) -1] /( sinx cosx) using FOIL on (sinx+cosx)(sinx+cosx)
=( 2*sinx*cosx)/( sinx cosx) using sin^2x+cos^2x=1
=2

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Just multiply ... it is (sinx)^2 + 2sinxcosx + (cosx)^2 -1

There is a property... (sinx)^2 + (cosx)^2 = 1 ...

Then it change to 2sinxcox .... as it will be divided by sinxcosx then the answer is 2 ... Ok!

3 is not a correct answer.

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( (sinx + cosx)(sinx + cosx) - 1 ) / sinxcosx
= ( sin²x + cos²x + 2sinxcosx - 1) / sinxcosx
= (1 + 2sinxcosx - 1) / sinxcosx
= 2sinxcosx / sinxcosx
= 2

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no the answer = 2 from the sinxcosx cross product

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If it's so simple, why can't you do it?
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