Evaluate Definite trig integral

Hi all,

I have the following Question and my answer is not tying up with the answer given in the text book-it's probably me but this book has been wrong a few times already.

So that i do not waste anymore time can somebody tell me whether it's me or not?

Evaluate Integration sign(cos x.dx) between (pi/4) and 0.

Sorry must look at how to use tex...

The integral of cos x is sin x, and sin(pi/4)-sin(0)=0.0137

The book gives 0.707?

Help appreciated

John

Re: Evaluate Definite trig integral

Quote:

Originally Posted by

**celtic1234** Hi all,

I have the following Question and my answer is not tying up with the answer given in the text book-it's probably me but this book has been wrong a few times already.

So that i do not waste anymore time can somebody tell me whether it's me or not?

Evaluate Integration sign(cos x.dx) between (pi/4) and 0.

Sorry must look at how to use tex...

The integral of cos x is sin x, and sin(pi/4)-sin(0)=0.0137

The book gives 0.707?

Help appreciated

John

You need to change your calculator's mode from degrees to radians.

Re: Evaluate Definite trig integral

Re: Evaluate Definite trig integral

Also $\displaystyle 0.707 \approx \dfrac{\sqrt2}{2}$