Integrate int (sin^2(t) + cos^2(t) -1)dt from e^x to e^(2x)

[cooltee13]

Homework Statement

Integrate from e^x to e^2x: (sin^2(t) + cos^2(t) -1)dt

Homework Equations

just standard integral equations

The Attempt at a Solution

I know how to do most of it, my only question is: is (sin^2(e^2x) + cos^2(e^x) -1) a special trig identity? or would i just solve it like a normal interation in parts problem?

 

[sutupidmath]

well it seems trivial to me... lol
This question seems to be just tricky, nothing else.

 

[regor60]

Aren't the sin and cos together adding to 1 the way you've written it, thus 1-1=0 ? You may want to double check you have it correct

 

[sutupidmath]

\int_{e^{x}}^{e^{2x}}(sin^{2}(t)+cos^{2}(t)-1)dt=\int_{e^{x}}^{e^{2x}}(1-1)dt=\int_{e^{x}}^{e^{2x}}(0)dt=?

What does this equal to??

 

[cooltee13]

ok, thanks guys lol. I feel dumb now

 

[sutupidmath]

ok, thanks guys lol. I feel dumb now

Ok, integrate the following:

\int_0^{ln(1)} sin(x)e^{-x^{2}}dx

This question was somewhere i don't know where though. Give a shot to it.

HINT: THis is also tricky.

 

[cooltee13]

\int_{e^{x}}^{e^{2x}}(sin^{2}(t)+cos^{2}(t)-1)dt=\int_{e^{x}}^{e^{2x}}(1-1)dt=\int_{e^{x}}^{e^{2x}}(0)dt=?

What does this equal to??

Isnt that just equal to 1?

 

[rocomath]

Look at your limits of Integration

From 0 to Ln(1)

 

[sutupidmath]

Isnt that just equal to 1?

Why on Earth do u think it is equal to 1?

 

[sutupidmath]

Look at your limits of Integration

From 0 to Ln(1)

How did u change your display name?