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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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