Question

evaluate the integral:
∫cos²x on (0, π/4)

Answer 1

?

Answer 2

Hints: \[\cos^2x=(1+\cos2x)/2\]
this is the one of the Power-Reducing Formulas.
then you integrate it.

Answer 3

woah my teacher never taught me that formula.. i don't think she would want me to do it in a way she hasn't taught

Answer 4

Then I can't help you further than than :(

Answer 5

darnit :( is it a fairly easy formula to understand?

Answer 6

do you know this?\[\cos(2x)=2\cos^2x-1\]

Answer 7

no i haven't learned that

Answer 8

then might be a little hard to explain...

Answer 9

sorry i have to go to bed but I will get to class early tomorrow to ask my teacher!

Answer 10

you can go to this website to have a see http://jwilson.coe.uga.edu/emt668/EMAT6680.2003.fall/Bismarck/6690%20folder/trigproofs/triproofs.html

Answer 11

ok~good night~