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Mathematics

OpenStudy (anonymous):

Evaluate the following definite integrals

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OpenStudy (anonymous):

\[\int\limits_{3}^{4}2\sin2x dx\]

OpenStudy (anonymous):

wolframalpha.com

myininaya (myininaya):

u=2x du=2dx if x=4, u=8 if x=3, u=6 \[\int\limits_{6}^{8}sinu du=-cosu|=-\cos8+\cos6\]

OpenStudy (anonymous):

yea thats what i got... my teacher must have put something in incorrectly...

myininaya (myininaya):

why?

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OpenStudy (anonymous):

i dunno... ive done it like 10 times and i keep getting 1.11 (same as my tutor) but Lecturer got 0.88 :S:S:S

myininaya (myininaya):

did you have it in radians or degrees?

OpenStudy (anonymous):

radians and degrees gegrees i got .81 or something like that but not .88

myininaya (myininaya):

i got 1.10 radians and .004 in degrees your teacher made a mistake

OpenStudy (anonymous):

yea... guessed as much lol.. >.< thanks though :D (currently writing cheat sheet for exam tomorrow) >.<

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